I would definitely play an armored paladin MC though, when they add the mythic abilities/feats for armor AC scaling.
This is what I hate about high level D&D since 3E. Armour becomes a trap, despite the art, setting, history of the game, etc. It sucks and it's retarded.
They should have some sort of offset to make higher level armour start dropping off the dex cap or something so that either being an armoured hulk is still preferable to running around naked, or at least comparable in some way.
It changes the game from being about e.g. knights and dragons and into being some sort of backflipping kung fu movie.
Problem is dropping dex cap also just means dex characters tank better still. There are just more ways to scale AC with dex and absolutely no ways to scale AC on armor itself except itemization (which owlcat was bad at in Kingmaker and okay in Wrathfinder). Maybe they could add ways for AC to scale off STR or CON then it would work.
In all honesty I think none of the dex/wis/int/cha to AC should exist, which originally was meant so that there could be dodgy archetypes no being so easy to hit without armor, rather they should be class features that just add non-scaling AC to other things with prerequisites, like crane style, despite its notoriety I think crane style is best designed non-armor AC bonus as it requires feat investment that only benefits defense and has prerequisites like using defensive style, having one hand empty and all else. That way a monk or duelist or whatever it is could keep up with armor with features.
Of course partially the issue is just how high stats you can get in this game too, getting secondary stats to AC isn't a big issue when highest stat is 22 (+6) and heavy armor gives you +10, it is a big issue when it is at 40 and you are getting +20 from it and best armor gives +14 and caps other scaling.