Powergaming is an edgecase. You have not beaten the game solo on either your first run, no savescumming or doing everything. This kind of meta stuff IS fun, yes. But it is not something you should take as an argument for balance. There are too many encounters that you cannot "see coming" or scout out to just do them solo without reloading a few times to make a strategy.
.
You completely missed the point of this paragraph. Which was, you know, that if "that specific absurd case" is possible, than a party of 4, which is far less extreme than the absurd case, is not only possible, but not even difficult. There is nothing in the game forcing you to use surfaces. There is also nothing in the game that forces you to rest after every encounter. Those were the claims that were made. The assumption was, "surfaces don't work in a system where you are expected to go through multiple fights without resting." The funny thing is, to disprove an absolute like that, I only have to present a single counter example (which I did). But even if you look at the game itself and not the hypothetical I presented, its just not the case. You aren't forced to rest after every fight. You can play through multiple fights without resting, yes, even without meta knowledge.
Hex and HM are not a thing you MUST do every round. You are always presenting specific situations, not things that are general. But balance has to work in general.
The *point* was, that there are many useful bonus actions you could potentially use. There is an opportunity cost to using a heal and on MOST turns, your bonus action would be better used doing something else. I could give other examples if you want them, but since it seems you don't like specific examples, think of it in terms of, "out of the list of all the things you could possibly do with a bonus action, healing yourself does the least to either mitigate damage or deal damage to the enemy." In combat, you want to spend the amount minimum of time possible healing yourself, since its only extending the fight and leading you to take more damage over all.
