@AncientSwordRage was about to drop this on meta, but you're here so maybe this can be headed off at the pass:
Okay, +1 because I think it's a good idea to tag some questions and to come up with a good, consensus set of guidance/principles. But I think I must be skipping gears, because I don't see what the first question you linked ("role-play with ability scores...") has anything to do with mental health. Is it the line at the end about how a STR 5 character claiming to be Paul Bunyan would be considered insane by those they meet?