I'm really surprised by the clear logic of this. Lots of interesting corollaries follow:

• Roles are an efficient optimization to use instead of acting dumb (provided you got trained in the right ones).

• To train your chosen roles is a good idea.

• Roles can be tuned to better match your needs.

• It should be possible to look for missing roles covering interesting behavior patterns.

• All of the above implies rational behavior can be trained.

The clear exposition makes this Main material although I wonder whether that applies to cross-posted material. I also wonder how to place this in the sequences context. Seems to be related to Teachable Rationality Skills and Rationality Dojo. It also reminds me of Geek Fu - which I did consider as rather humorous until now.

EDIT: Typos fixed.