its just bad/good/normal gamedesign logic.
need to deal with it.
and aslong as you are not 5+ people you probally can get enough ressources in 20 reallife hours to equip everyone even with the worse rng.

just so you know
trolls inside caves dont respawn either, just the outside once do.
so the changes to mistland would be out of gamelogic sofar.
only plants replenish normally in the gamelogic.
like glowing mushrooms in crypts.