Justice and Rule
Legend
Inflated numbers are really an uninteresting way to do that IMO. If you feel you need them, pick up a feat that has a +1 and something else. If you are really worried about the numbers, having 2x feats would allow you to get all the numbers upgrades plus a lot of interesting extras. But it makes it a choice.
IME, you don't need stat progression in 5e. But if you do, no skin off my back. Give'm ASIs and Feats.
That doesn't make my fighter a better speaker or my Rogue wiser. The problem is that we are talking about a system based around numerical rolls and to be better at things, we ostensible need two things: better stats or better proficiency. The problem is that proficiency is locked in, so the only way to improve outside of that is through ASIs (or maybe an expertise feat).