billd91
Not your screen monkey (he/him) 🇺🇦🇵🇸🏳️⚧️
I think AC should scale at the same rate as attack bonus. To me, it's never made sense that characters only ever get better at attacking, but never get better at defending themselves. It seems that they're afraid of players getting really high ACs and becoming nearly invincible, which is a valid concern, but I blame the magic item bonus stacking for that problem.
A character's ability to defend themselves already goes up with level even if AC does not. They gain more hit points, which really is an element of the PC's defense. Their improved skills (and other intangibles) make it easier for them to minimize the damage (relatively speaking) of a hit. Raising AC as well means you're raising defenses in two ways and that strikes me more as bloating the numbers rather than really improving things.
Rather than increasing ACs, I'd rather PCs were able to trade their advancing attack bonus for defense - combat expertise, fighting defensively, etc. They step back their offense to concentrate on defense. I find that a much more satisfying way of handling some of the AC side of fighting.