Mechanically is not even a matter of "everyone gets the same amount".
It's literally "Your MC is the only one getting EXP and everyone else is automatically levelled up to his amount.

On one hand I'm fine with companions autoscaling exp, but on the other hand I'm not sure how to feel about the fact that no matter if you play solo or full party, the amount of XP per-person stays the same.

Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN