I like concentration, mostly as it limits buff stacking that I felt have been a bane of D&D for a long time - by limiting some spells to one per cast we avoid that.
As Niara said, BG3 is particularly unfriendly to concentration spells, to the point that I rarely opt to use the defensive ones, or accept that they will likely disappear before the end of the turn, as NPC will target the caster on mass with unavoidable granades and surfaces.
Solasta had quite an OP homebrewed feat that would prevent concentration rolls from if caster took less then 10 damage. I feel BG3 would benefit of something like that, considering how common low unavoidable damage is.
Seconded.
Stacking buff is not fun. At some point in the game where you have 10+ possible combination of buffs it becoming a burden. Example already exist, almost everyone who plays both Pathfinder game does not like it, somebody even make a mod to automate the process.
For me, it make Constitution matter. At this point, if not for maintaining concentration, Con is more or less, a dump stat. Why should I put point in Con if I just can focus on Dex or Wis or Str?
