Thomas Shey
Legend
For whatever it's worth, I don't agree with his take. The math of the game is tight enough that as a GM, you can easily run a game that isn't reliant on ideal composition without too much trouble. This page on Archives of Nethys gives an overview of how to balance an encounter.
Ideal, no. But if you aren't paying attention to group composition when choosing characters, there's no particular reason to assume someone will be better about it in-play, and I think that's deadly in the system unless the GM corrects for it.