This is addressed by the fact that you can rest freely in BG3.
Which is another problem and make the whole point of short rest to regain WLK power pointless.
Agreed.
No, it [is a big change]. For casters. A single magic missle can end a goblin on 5e but not on BG3.
A Eldritch Blast on 5e at lv 1 can OHK a goblin. On BG3:EA at lv cap can't. -snip-
Eldritch Blast is a cantrip. This is equivalent to a fighter's basic attack. In 5e, both can kill a OHK a goblin (if they hit). In BG3, neither can, but they have increased chances to hit.
True about magic missile. Magic missile is indeed nerfed against goblins in BG3; you'd have to roll all 4's to kill a 15HP goblin.