(My confusion with the post is that I'm not sure what do you mean by "value". Today and tomorrow are not alternatives in any straightforward decision problem ("waiting a day" doesn't make them into alternatives either, it doesn't even seem to be a relevant decision, more of a personal identity word game; if you wait for tomorrow, today still happens). One possibility is that you might compare their potential as optimization targets, so that the decision in question is where to focus your optimization effort, but the wording of the post doesn't seem to naturally fit this interpretation.)
Consider the choice: cause the world fo today to exist, or the world of tomorrow.
We often talk about whether X or Y is better when they are not alternatives in a straightforward decision problem, for example is it better to receive an A- or a B+ on a test, and how much? We don't choose between X or Y directly, but considering their comparison helps provide intuition about more complicated comparisons between possible outcomes. We don't choose between the world of today or the world of tomorrow, but we also don't choose between performing better or worse on a test.
Over the last few months I've started blogging about effective altruism more broadly, rather than focusing on AI risk. I'm still focusing on abstract considerations and methodological issues, but I hope it is of interest to others here. Going forward I intend to cross-post more often to LW, but I thought I would post the backlog here anyway. With luck, I'll also have the opportunity to post more than bi-weekly.
I welcome thoughts, criticisms, etc.