Blackwarder
Adventurer
The details will be everything. For me it is just more of the "D&D was broken so we have to fix it" mentality rather than "D&D was good, so lets see what it got right". HP were not perfect but they were a nice simple solution. Tis is just a level of complexity I dont want in D&D. And I never had an issue with magical healing being important if you wanted fast recovery. This feels very much like a luke warm healing surge mechanic to me.
But it's not healing surges because you don't use it in combat or as your sole healing mechanic.
Warder