Early thought is that POE2 seems to often take systems that were flawed but decent and often fun in the first game, throw it all out & rebuild it, and end up with something that's just as flawed and not necessarily any better.
One is the streamlined per-enc abilitieis. The other is going from health/endu + camping supplies, to regen health + wounds + free rest.
I'm sure that if you played IE by resting every 3 steps you are happier with the change, but (1) wounds have never been as significant as the lowered ceiling of health or the running out of per-rest abilities; you can barely notice the little blood drips on the UI, your character on the main screen looks fine, and it restrains him passively whereas running out of abilities restrains his active behaviour. (2) the combination of these features mean that you play like a restwhore every battle, using all your abilities without care, and then when you get so many wounds that your character is a walking wreck, you rest without consequence.
i.e. we have gone from a system that encourages attrition-based gameplay (with some costin convenience/annoyance), to a system that seems to encourage restwhore gungho. That's a big decline in my book.