Me, surly? Why I never sir!
If you're not saying powergaming can't be a factor, fair enough - by my experience of this sort of approach to mental stats being used to try and cheese stuff is a big part of why I'm allergic to it (that and that it's solely used with mental stats), and
@iserith seems to be describing doing precisely that, as justified as he might feel about it.
@iserith - I kind of get where you're coming from re: stacking the deck and avoiding rolls, because the binary d20 stat check/skill check in 5E is absolutely obnoxious outside combat, but I've seen too much bad behaviour with that too really support it. It is however part of why I no longer run 5E much and mostly play.
I've also seen DMs respond to concerns about it by just making people make practically-constant CHA checks and the like (not me), and that is pretty awful as a solution. I guess the problem is fundamentally with 5E and the wide variance combined with the binary success/fail, and lack of mitigating factors (like Take 10/Take 20) outside of specific class/subclass features.