Apologies for reviving a months old thread, I just wanted to add my two cents hoping it might add some perspective. Alot of the issues stemming from rules interpretation remind me alot of what you go through with pen-and-paper RPGs, where those same questions/arguments can occur. Take Endurance Points and what they might 'mean' in terms of healing. It reminds me alot of what I read about in 1st edition AD&D regarding HP:
Forgive the volume of quotation, I wanted to fully establish the context I am trying to make. Basically EP are at least as abstracted in gameplay as HP are in AD&D or any other RPG. It can represent physical injuries (cuts, stabs, scrapes, bruises) it can also represent other things. Fatigue*, hunger** and thirst, environmental exposure, and so on. Keeping track of all the possible things EP could do individually would be tedious, but I'm not sure you need to. Nothing about Lone Wolf has ever suggested to me he's like Marvel's Wolverine. If stabbed in a vital area, Lone Wolf will die. The supernatural abilities give Lone Wolf and other Kai Lords certain edges (ESP/precognition, psychokinesis, etc.) that can aid in minimizing harm (and thus EP loss) but in most cases it's not going to make the Kai Lord have skin like plate armor and bounce of sword strokes or give them ultra-regenerative abilities.
Obviously you could consider stamina (physical energy to do tasks) a big part of EP as well as physical ability to sustain wounds, an ability to resist shock and pain, etc. Strenuous combat (or a succession of combats) may wear you out, but rest and sustenance will help replenish that (and thus 'restore' EP.) Healing likewise could be considered an accelerated ability to 'recover' from fatigue and exertions. Since both rest and food could be part of this process, you can partly make a case for Healing (or other means) restoring EP from hunger (if you're hungry, you're going to be low on energy and find it hard to concentrate. Which is going to impair your ability to fight and increase the chances of taking a fatal injury).
On the other hand, good diet is a big part of being able to heal wounds and other injuries. And a poor diet can impair the ability for wounds to recover (or make things worse. Your body will cannibalize parts of itself to keep your body running, after all and THAT is damage.) That argues against using healing to recover EP.
That seems contradictory, but I think it's a matter of degree and how one chooses to interpret the rules or 'manage' EP. It's largely a personal choice. If people want to keep it simple they can justify EP loss from hunger or other 'non-combat' exertions being healed. Or only partly healed. Or you could assign a ratio of EP that can be 'healed' and a percentage that can't be by certain methods (which I believe is represented in some programs like Seventh Sense.)
Whether potions or other stuff can also heal EP would also depend on what aspect of EP abstraction you might imagine it affecting, and in a medical sense it could do alot of stuff.
*There is at lesat several cases for 'EP as measure of fatigue' I can think of. And you can collapse and die from exhaustion.
Caverns of Kalte when using the Sommerswerd to cut through the door. A similar situation occurs in
Kingdom of Terror where you have to engage in 'combat' against a door and the EP loss represents fatigue from your efforts.
These two scenes are interesting because they're essentially two different approaches to the same thing. In the rules, you could restore EP for 'fatigue' against the KoT door because it's technically a 'combat'. Whereas in CoK you wouldn't because it isn't one.
Conversely, in
Shadow on the Sand, the night's rest you get aboard Skyrider restores EP (removing fatigue and giving your body time to recover - some of which will be physical healing of course.)
**In that same scene chain in Shadow on the Sand before you drink the Bor Brew
consuming a hearty meal also restores EP (3 EP in fact, the opposite of what you lose if you didn't consume a meal in other places!) It's not the sole case either where rest or more mundane food/drink restores EP either.
This would also explain why some supernatural abilities (magic, or Kai/Psi-surge) drain EP as well - its the exertion/fatigue/loss of energy rather than physical injury.