But there is one key problem here, though, and that is that a good DM will make those rules changes in consensus with their players. But that's not what's happening here, where Larian is that authoritarian DM who unilaterally imposes their rules on the game. Yes, it can be argued that since DM Larian is dealing with potentially millions of players in their game, consensus is not possible. Sure, but I see that as Larian's problem to solve, not mine.
That's what mods are for.
For example, right out of the gate, I'm going to be modding my game to allow 6-man parties. I'm not going to complete it with 4 to start with because "that's the way it's meant to be played". I'm going to play it the way I want to play it.
And if the non-origin hirelings aren't to my taste, I'll find a way of modding them so they are.
I'm sure that over time there will be many, MANY mods for this game, allowing you to tailor it to suit however you want to play.
