Some people putting the cart before the horse here.
Concentration is fine the way it is. Prohibiting a caster from stacking buffs on top of each other is by design and a healthy thing for the game balance. No pre-cast orgies, no CoDzilla, no overpowered CC, less caster-martial imbalance.
The actual issue for tabletop is that some spells shouldn't require concentration. And for BG3, that there is too many instances of unavoidable damage at low levels, too many enemies with ranged weapons, enemies having additional attacks or instances of damage they shouldn't, and the prone condition causing concentration to be broken.
It's just one of many instances that shows that Larian either does not appreciate the extent to which their homebrew impacts the base system or that they were willing to experiment by throwing stuff at a wall and see what sticks during EA.
