Thanks for writing this - one of the more valuable posts IMO that I've seen on LW in a while.

Sort of expanding on what you said, this seems like a specific manifestation of gains-from-trade. I'm very, very happy that there are people who enjoy or are proficient at super-different things than I am because that way I don't have to do the things that I'm bad at or dislike doing unless it's something that I want to learn or get better at.

Also,

...and no one would try to change me. Because oh boy, have people tried to do that. It’s really hard to be someone who just wants to please others, and to be told, basically, that you’re not good enough–and that you owe it to the world to turn yourself ambitious, strategic, Slytherin.

Might be good for some to keep in mind that some politeness and friendliness norms sometimes serve a similar role to ethics in this sense. This sort of stuff and precaution tends to be more important in areas where you don't know a whole lot, such as when you're trying to prescribe actions for others when you know a rather limited amount about them.