Thus the shift from a world where map-accuracy and winningness are not the same thing to one where they're identical a posteriori is a nonlinear shift, and in my mind this legitimizes the use of the term "rationality".
Where's the nonlinearity, and why does nonlinearity legitimize the term "rationality"?
The nonlinearity is the following: once you realize the dark side epistemology/interconnected web of reality material, and you already think that the most "winning" course of action is to have an almost accurate map, you should decide that the most "winning" way is to have a fully accurate map. The intuition is that it is not winningness-promoting to deliberately make a small subset of your beliefs inaccurate.
This legitimizes the term because it is then empriically the case that winningness and map accuracy coincide exactly, so we can ...
Related on OB: Taboo Your Words
I realize this seems odd on a blog about rationality, but I'd like to strongly suggest that commenters make an effort to avoid using the words "rational," "rationality," or "rationalist" when other phrases will do. I think we've been stretching the words to cover too much meaning, and it's starting to show.
Here are some suggested substitutions to start you off.
Rationality:
Rationalist:
Are there any others?