As I said in the other thread: the world is organic--it is what it is. The PCs interact with it as best they can, but it makes no difference to me how many spell slots, hit dice, or uses of a feature a PC might have remaining when I plan an encounter--the encounter is planned according to the narrative of the world/story and the world-building itself.
For example, tonight was a harsh night for the PCs. Two were killed outright by a critical hits after their hp was reduced, another was knocked unconscious, and the other two fled. An NPC was also killed (but by the party LOL!). Their resources were fair, but they should have run, only one tried before going unconscious.
Anyway, the encounter was there because it made sense for the world-building that it be there. That is all that matters, for me, anyway.