I really don't get the 4 party size, it's really sad and fun breaking. The main issue is that you NEED a tank + a heal + you if you aren't you of the two mandatory (no I won't make mindfucking metabuilds).
I completed the game on tactician and i tell you this: you dont need tanks or healers. You need 2 martial classes with GWs, potions of speed and feats for GWs. Laezel as fighter and MC as paladin deleted every boss in 1-2 turns with obscene amount of damage you get from haste giving you full action.
Right now BG3 is way too easy with 4 characters in the party, you can nuke every encounter, just buy and use consumables.
