BG3 has levels for the NPCs instead of a CR. That would usually indicate a 1on1 comparison. Even if not, the higher stats of a lot of NPCs sours a lot. Especially Hit/Save ratio. Too high numbers on the NPCs make a lot of skills far less usefull than they should be since the NPCs get hit less and save more if hit.
You see that especially on spells like guiding bolt where a save completely negates the effect. I hardly use those because most of the time i get either a miss or a save if hit. For me, that takes a lot of fun out of combat. Many tactical choices fall because a magic missle is more effective just because it always works
(apart from the strange LoS they have in BG3, but thats another matter).
+1