We are opposite. My players make their characters so they can have fun. The only thing they tend to ensure is they have the necessary healing for group survival. They don't worry about balance. If it's in the rules, it is fair game. If it becomes a problem, they expect the DM to handle it.My group tends to assume the opposite on both scores. Players are expected to build their PCs having in mind the fun of others, thinking about how their PCs might fit into the bigger picture of the game and the play experience. They are also expected to build keeping balance in mind. This isn't appropriate during actual action resolution - I find there is nothing quite as insipid in RPGing as having to hold back your PC so as to avoid overshadowing/dominating - but PC build, being a pre-play rather than play stage of the game is precisely the right point to have regard to balance issues.
Practical examples I can think of in games I've GMed are players making choices about spell selection, or about feat selection, having regard to imbalances that some options might lead to. I have vague recollections of race choices being similarly influenced by balance concerns.
Very different group. We've been together a long time now. We have fun together. But we don't spend time worry about whether the guy next to us approves of our character or not. That's a very strange concept I've not heard too often.
Would like to see that data. GMing is always in the minority as far as numbers go in the TTRPG world. That's why DM centered books don't do as well in sales. But GMs are an opinionated bunch often more active in the hobby than players. So we could be more active on the forums.I thought most posters on ENworld were GMs. Isn't there some survey data about this?