You touch on an important point. The D&D long rest resource resource management system can make sense when you’re doing a dungeon crawl and you’re actually into the whole “do we have enough supplies to go deeper or do we turn back thing?” But my understanding is that’s not how most people actually play. There was a poll going around a couple months ago that revealed most D&D groups do one fight per long rest.
If you’re just doing one fight per long rest, you’re doing per-encounter powers badly. That screws over the on-paper short-rest classes, and forces the story’s pacing to be slow to account for the “ok you sleep for another day” thing.