4 is a party but 6 is also a party.

Divinity: Original Sin II have 4 men party and lone wolf and both modes are fun. I don't understand why people would outright dislike the option for party of 5 or 6. Larian can balance it just like they balanced the Lone Wolf mode and people can have fun with either 4 or 6 party size. Problem solved. Win-win.