Thanks for realizing that your classification system might be incomplete.

I emphasised I found it a somewhat useful frame for thinking. I really hope I didn't imply in the OP it was the only, best or most complete one!

I consider adaptive explanations to be chancy-- it's hard to be sure which features are doing what. And it's interesting that you're more apt to bring in adaptive explanations when you know the least.

This reminds me a lot of common failings when using pop evolutionary psychology.