About 90% of the locations in the game are so small that you cannot physically rest more than 2-3 times (if you do it after each fight)
Well, I don't.
Nor I want to be able to.
In fact, being able to "rest after each fight" is exactly what any barely competent rest system should discourage.
My point is that you can't rest more than 2-3 times because there aren't that many fights in a given location.
More likely, however, is that you will not have to rest more than once at the very beginning (just to get rid of exhausted)
