+1 for not being able to long rest and instantly teleport back to camp at any time, especially from the middle of the Underdark. This is before you’re even high enough level to cast teleport. Truly immersion breaking (much as I’m starting to hate that word). Making it impossible to long rest from certain regions would make those areas far more interesting, short rests and other resources (spell slots, potions, scrolls) would become much more valuable and this would add a whole new tactical decision making dimension to the game.
