I vote for having a party size of up to six. The original Infinity Engine games didn't need to be rebalanced if you decided to solo the games or take only a party of four instead of filling up all six slots. And being able to experiment and change your lineup was crucial in BG2. I loved hearing different pairs of characters interact. If the party is fixed after Act 1, then that takes away a key aspect of the original games that made them so enjoyable. And if Larian didn't want to honor BG1 and 2 then why frame BG3 as a sequel?