24 hours of full health/resolve restore after battle.
Huh, is that right? I was under the impression it was just restoring twice as much HP and Resolve after the battle. Anyways, my point is that doesn't help you during said battles. The whole argument you presented is fine assuming one can win, and if one is playing on Dark difficulty a lack of viable resolve restoration methods during combat is the issue.
My reference to camping supplies was more along the lines of needing to either flee then sleep to restore resolve before another fight, or somehow scrape a win if you're being punished by resolve. Either of which is a direct result of not being capable of dealing with resolve issues during fights.
