Adding more party members doesn't decrease difficulty linearly.
Don't split exp linearly then?
But jokes aside, it's NOT that important, in case you missed it. People already openly stated that they would be willing to "take the hit" to the overall balance as long as they can have it as an optional feature.
I am absolutely fine with Larian going wild with custom settings, I love being able to tweak a ini file to fit the game to my envies. I just want for Larian to pick a number, stick to it and design everything around it. Adding more options expose them to having to do more balancing, UI and gameplay work, and potentially a bad experience out of the box.
