Oscar made a list of things that were allegedly in the tradition of Feynman and Popper. He was wrong about those. Furthermore, Feynman and Popper are in a different tradition to Aristotle, which is conventionally called "traditional rationality". Oscar says that Bayesianism is not "traditional rationality", meaning it is not Popperism, but it is firmly in the mainstream tradition of Aristotle: it is conventional traditional rationality.
but it is firmly in the mainstream tradition of Aristotle
It really isn't.
Aristotle is one of the few philosophers who is explicitly named and criticized in the sequences.
In several places in the sequences, Eliezer writes condescendingly about "Traditional Rationality". The impression given is that Traditional Rationality was OK in its day, but that today we have better varieties of rationality available.
That is fine, except that it is unclear to me just what the traditional kind of rationality included, and it is also unclear just what it failed to include. In one essay, Eliezer seems to be saying that Traditional Rationality was too concerned with process, whereas it should have been concerned with winning. In other passages, it seems that the missing ingredient in the traditional version was Bayesianism (a la Jaynes). Or sometimes, the missing ingredient seems to be an understanding of biases (a la Kahneman and Tversky).
In this essay, Eliezer laments that being a traditional rationalist was not enough to keep him from devising a Mysterious Answer to a mysterious question. That puzzles me because I would have thought that traditional ideas from Peirce, Popper, and Korzybski would have been sufficient to avoid that error. So apparently I fail to understand either what a Mysterious Answer is or just how weak the traditional form of rationality actually is.
Can anyone help to clarify this? By "Traditional Rationality", does Eliezer mean to designate a particular collection of ideas, or does he use it more loosely to indicate any thinking that is not quite up to his level?