Sticking with 4 character party makes it that much harder to argue against people that say this is DoS 3 and not BG 3.

Also, it seems like a prominent argument is that we will have more companions at full release, so a bigger party is better. Agreed with that.

BUT ALSO

Planning for full classes to be released, in addition to all of their subclasses, means the game will have tons of options. Presumably we'll also get 'mercenary' characters aka multiple Player Characters you can specifically design (you know, like in BG 1 and 2). Bigger party = more ability to try new things out, rather than being constricted to just 4.

Here's the thing I don't understand:

For people that only want 4....why do you care if there's the possibility of having 6? Literally nothing stopping you from just doing a party of 4. Hell one of the most popular challenges in BG 2 is the solo playthrough. So if the limit is 6, that pleases a lot of people that want the more traditional Baldur's Gate/D&D experience. But it also lets people who want the limit to be 4 to also have a party of 4. It's literally the best of both worlds, while a limit of 4 means the bigger party people can never have what they want.