And the world would be more alive with a sense of potential danger around every corner via random encounters. Don't sleep in dangerous places, or BAM! You never know what might attack you in the night. Best find a safe spot to rest first. You won't be as inclined to long rest in a goblin camp that's hostile to you because you might just trigger a fight you can't handle. Best to be sure you're well prepared before going into such dangerous places and/or find a safer place in a room where you can lock the door before long resting. And wizards and clerics won't be nigh invincible at higher levels because spamming long rest to recover spell slots may just be their undoing.
Argh... I hope this will make you happy https://twitter.com/LarAtLarian/status/1306179349494849536 Also if you didn't notice: the sleeping cutscene is actually 2 cutscenes playing one right after another with our HP beeing restored after the first one. I believe it is made that way to be able to put an encounter in between.