This recent blog post strikes me as an interesting instance of a common phenomenon. The phenomenon looks like the following; an intellectual, working within the assumption that the world is not mad, (an assumption not generally found outside of the Anglo-American Enlightenment intellectual tradition) notices that some feature of the world would only make sense if the world was mad. This intellectual responds by denouncing as silly one of the few features of this vale of tears to be, while not intelligently designed, at least structured by generalized evolution rather than by entropy. The key line in the post is
"Conversely in all those disciplines where we have reliable quantatative measurements of progress (with the obvious exception of history) returning to the original works of past great thinkers is decidedly unhelpful."
I agree with the above statement, and find that the post makes a compelling argument for it. My only caveat is that we essentially never have quantitative measures of progress. Even in physics, when one regards not the theory but the technique of actually doing physics, tools and modes of thought rise and fall for reasons of fashion, and once widespread techniques that remain useful fall into disuse.
Other important techniques, like the ones used to invent calculus in the first place, are never adequately articulated by those who use them and thus never come into general use. One might argue that Newton didn't use any technique to invent calculus, just a very high IQ or some other unusual set of biological traits. This, however, doesn't explain why a couple of people invented calculus at about the same time and place, especially given the low population of that time and place compared to the population of China over the many centuries when China was much more civilized than Europe.
It seems likely to me that in cases like the invention of calculus, looking at the use of such techniques can contribute to their development in at least crude form. By analogy, even the best descriptions of how to do martial arts are inadequate to provide expertise without practice, but experience watching experts fight is a valuable complement to training by the relatively inept. If one wants to know the Standard Model, sure, study it directly, but if you want to actually understand how to do the sorts of things that Newton did, you would be advised to read him, Feynman and yes, Plato too, as Plato also did things which contributed greatly to the development of thought.
Anyone who has ever had a serious intellectual following is worth some attention. Repeating errors is the default, so its valuable to look at ideas that were once taken seriously but are now recognized as errors. This is basically the converse of studying past thinkers to understand their techniques.
Outside of physics, the evidence for progress is far weaker. Many current economists think that today we need to turn back to Keynes to find the tools that he developed but which were later abandoned or simply never caught on. A careful reading of Adam Smith and of Ben Franklin reveals them to use tools which did catch on centuries after he published, such as economic models of population growth which would have predicted the "demographic transition" which surprised almost all demographers just recently. Likewise, much in Darwin is part of contemporary evolutionary theory but was virtually unknown by evolutionary biologists half a century ago.
As a practical matter a psychologist who knew the work of William James as well as that of B.F. Skinner or an economist who knows Hayek and Smith as well as Samuelson or Keynes is always more impressive than one who knows only the 'modern' field as 'modern' was understood by the previous generation. Naive induction strongly suggests that like all previous generations of social scientists, today's social scientists who specialize in contemporary theories will be judged by the next generation, who will have an even more modern theory, to be inferior to their more eclectic peers. Ultimately one has to look at the empirical question of the relative per-capita intellectual impressiveness of people who study only condensations and people who study original works. To me, the latter looks much much greater in most fields, OK, in every field that I can quickly think of except for astronomy.
To the eclectic scholar of scholarly madness, progress is real. This decade's sludge contains a few gems that weren't present in the sludge of any previous decade. To the person who assumes that fields like economics or psychology effectively condense the findings of previous generations as background assumptions to today's work, however, progress means replacing one pile of sludge with another fashionable sludge-pile of similar quality. And to those few whom the stars bless with the coworkers of those who study stars? Well I have only looked at astronomy as through a telescope. I haven't seen the details on the ground. That said, for them maybe, just maybe, I can endorse the initial link. But then again, who reads old books of astronomy?
Finally I just want to say that surely you don't disagree that there is something different about what happens in physics than what happens in astrology do you? I don't care about deep principled distinctions here but just at a purely practical level physics (and the other sciences) let us make strictly more things now than they did 10, 50 or 100 years ago.
The notion of progress I had in mind is much much weaker than yours. I just mean that sometimes we discover shit that we find very useful (transistor technology) and that the useful consequences of scientific discoveries (be it new theories or just accurate measurements of molecular weight) are rarely lost.
In other words all I'm saying is that if you wanted nifty fun gadgets to play with or technologies to save your sick wife or the like and you had the chance to pluck 10 great scientists from any time in history to help you out during development you'd pick them from the future not the past. That is physicists can now give engineers theories that let them build both chips and buildings while before they only gave them building theories.
Ultimately, however, the aim of my post was to establish that there isn't some kind of important knowledge best gained through the reading of original sources. The target of my argument was the frequently given argument that somehow spurning these great original works puts you at some kind of real (not just bad taste) intellectual disadvantage in terms of learning/knowledge relative to those who do.
Given that new 'great' originals continue to be published albeit quite slowly one can immediately conclude that either we are making progress or that there is no reason to believe reading great originals gives you a boost (i.e. helps you make progress). After all if we aren't making progress then these new books can't give later generations a boost (that would be progress) hence, one can't justifiably claim that reading great originals is an aid to academic/intellectual progress.
Given that my claim is an entirely negative one I need not make any assumptions as you allege. Rather I'm just offering a reducto of position that you are simply dismissing from the start.