Interestingly, that's how w o t r handled some of their larger scale fights. While fighting enemies in the Gray Garrison, you witness Irabeth leading troops against demon forces in other places nearby. It is not turn based combat that is all taking place at the same time you are fighting a few demons here and there.
There is a delicate balance to be had. I will say that certain battles felt a little too long in wotr. However, I do feel like in bg3 in certain places it just feels like there aren't maybe as many enemies as there should be based on the story.
Battles that feel like there should be more enemies are like the fight on the helm in the prologue. Feels like there should be more bodies, more enemies fighting all around, etc. The battle at the grove gate, as mentioned. And why isn't there a single druid helping defend the Druid's Grove? Come on. There should be far more enemies and allies based on the story and the way everyone treats you.
More spiders in the spider lair. More skeletons in the necromancer lair. More animals in what they call the forest and also the bog. Not high powered enemies, mind you, and maybe not even enemies you have to fight, but more things moving and lurking around. As you pass through the spider lair smaller ones skitter away. As you pass through the forest small animals run into hiding, birds fly away, etc.
