I'm pro 4 man party. It looks like there will be interjections and interactions when interacting with NPCs from what Larian has said, and all the possible combinations would eat away at the writing, VA, and animation budgets. It's one of the advantages of a game with less voice acting, motion capture, and cinematic angles. Still think it's worth it, and also cuts down on lengthy combat.
None of these arguments makes much sense.
The fact that there are supposed to be inerjections between party members if anything should make people desire to have an even bigger party, to not have to miss most of them.
But that's a bogus point anyway, because the numbers of interjections between two companions are NOT going to raise or lower in numbers according to how many other companions are around. What will matter is just if you'll have the two of them.
And for how they worked in DOS 2, anyway, help to shred a single tear for that loss... Companions hardly ever talked to each other. Everyone acknowledged just the existence of your protagonist.
If voice acting and animations were going to be an issue, they would just be mor sparse with their use. It's hard to even follow the logical thread that led you to suggest it's a problem that can be solved with a smaller party.
Dulcis in fundo, as SEVERAL posts already pointed so far, if you actually prefer a four men party it's not clear how the option to ramp up to six for other people would stop you.
It didn't stop anyone playing BG2, for one.
