FormerlyHemlock
Hero
Well according to the rules, you can only do one long rest per day. That means you have 16 hours you need to play out before you can do another one. Inside dungeons for exactly it is recommended to proceed time in minutes. Some actions like searching a whole room takes several minutes, but still, you will get at least say 200 rounds outside combat before the day comes to an end. Unless you do short rests in between to proceed some time. But that's still a lot of sitting around and waiting in enemy territory just to be able to take a long rest again. Or alternatively, the group enters the dungeon, does 2-3 battles, then travels back the next town, rests, goes back to the dungeon, does another 2-3 battles, leaves again... hmm it seems boring to me. And reduces the excitement of having to conserve resources and being scared of getting out alive.
You're making a certain set of assumptions here, including "what happens in the room stays in the room." In my game it would be more typical that the noise you make during a fight draws creatures from nearby rooms, either immediately or after a short delay; instead of fighting eight tiny groups of 2-3 bugbears at a time you're dealing with two dozen bugbears in the immediate vicinity, and your job during the fight is to handle them quickly enough that you don't get overwhelmed. Same bugbears, different assumptions--and doing it all as one fight actually makes it (potentially) harder, not easier.
Successfully taking an hour-long break in the middle of that fight is not likely unless you've already repulsed the bugbears and they've withdrawn to rest and/or change up their strategy.
I just can't make myself believe in the idea of 6-8 discretized fights that don't overlap at all, unless some of those fights are simple assassinations that are over during the surprise round with no noise during the kill.