If spells are being "spent" apparently some kind of resource will always be needed to "buy" them back. Whether it's buying camping supplies and spending them to regain spells, or a potion that will let you "recall" used spells, graded by some points-based system, that's not that big a difference.
In my opinion, and from all I've seen of people's playing habits, the complaints about the resting mechanic being exploitable are made mainly by people who are already exploiting it, because they want to and because they can.
I don't exploit it in my games, and I didn't exploit it in the IE games either, so it's no problem for me that it's exploitable. I think it comes down to playing habits, and I don't see what's really there to complain about - if it seems exploitable to you, just don't take advantage of your ability to exploit it, and you're ok. If you are exploiting it, you have only yourself to blame.
I also don't think any variation of the resting mechanic can be made impossible to exploit. A game designer is always at a disadvantage against a player who is looking for ways to exploit the game. A no small part of the players as a whole find satisfaction in their games exactly in looking for exploits.
I stopped playing PoE because of the continuous changes. Seriously, redesign of skills and encounters really makes me happy and I simply won't touch the game unless they're done with it. Been playing Blackguards instead...
Agreed, and same here.
PoE has one of the strangest histories I've seen. A game being released in a half-baked beta state, getting great scores regardless, because it's innovative in its turning to the (perceived as such by most people) "roots" of the genre, instead of trying to be a B-quality CGI movie which is currently the norm (it also has pretty backgrounds and a combat system that manages to pose as very hardcore). This already 9/10 RPG then has to be patched over the course of the year, expecting to reach what, 13/10 by February 2016.