What's the next step in crpg ? Buttons to auto regain HP because its sooo coool in BG3 ?)
Auto-regaining HP/resources (presumably after fights) is a perfectly fine mechanic to use.
However, the game should then be designed (or at very least balanced after the fact) for having full hp/resources each fight. And this is the problem I at least have with BG3. Larian has made very few efforts to balance classes to be equally strong for a single fight where you're expected to expend all your resources, but Larian also hasn't placed limitation on resting (in fact, BG3 encourages frequent resting via camp cutscenes) which encourages going into each fight will full resources. Basically they try to have it both ways.
The 2 things that do increase the power of martials per fight are:
1.) Weapon abilities - effectively giving martials pseudo spells, usable per short rest=per fight
2.) Everyone can use scrolls - literally giving martials spells (but also making all casters much more flexible)
Both of these act to close the power gap between martials spellcasters, and the former in particular are effectively per fight abilities. However, I'm skeptical that Larian implemented these mechanics
in order to balance classes around single fights with full resources. Especially since there are other decisions (e.g., Quicken's implementation) which increase the power of casters too.
I would be ~okay if Larian made sweeping changes to the D&D classes to balance all classes around assuming each fight is entered with full resources. I'm not confident Larian would do this well, given the past mechanic decisions they've made (surfaces, high ground & backstab advantage, Haste&Quicken implementation, etc), but I wouldn't necessarily disagree with the goal. I've enjoyed many games with cooldown combat systems.
