EXP gain shouldn't bother you as long as it's balanced. Adjusting for the intended length of the game, it may take more or less enemies than traditionally necessary to level up. A DM naturally provides higher challenges to players as they level up; if they have certain enemies they want to present to us for certain parts of the game, there's nothing wrong with slowing down or accelerating level gain. Especially since we can probably assume the game will be very long with a level cap of 10. Absolute by-the-book EXP gain restricts the amount of enemies you can possibly put in the game.
Or not. BG had respawning enemies and interruption, it gave you the option to level up faster if you wanted.
I hope you have that option in BG3, be it from killing more enemies or tons of side quests like in PoE.
