What are non-lethal attacks for?
Сan using a non-lethal attack affect the plot compared to a lethal one?
In D&D non-lethal attacks can be used to ensure NPCs don't die when reduced to 0HP, and only fall unconscious...this can be used to protect mind controlled civilians when going after a villain, capture an enemy alive either to turn in for some form of quest where he's wanted alive or for interrogation, etc. There can be extensive uses for them in D&D. Not sure how relevant or useful this will be in BG3.