It's valid feedback. Especially in BG3 where ST/conc spells are much weaker than attack roll/auto damage spells.
Most casters in 5e want to take the War Caster Feat, which gives Advantage on Cont STs. This gives you a ~75-85% chance to succeed on Con saves.
However, this doesn't help with only being able to cast 1 concentration spell, this is true. Especially bless vs bane, Bless is ~strictly better because it doesn't have any chance of failing whereas Bane can be resisted by enemies.
THIS is exactly what makes me believe it is broken. "most casters in 5e want to take war caster", if a feat is more or less mandatory to be a good spellcaster then something is wrong.
I want to play a caster to see my spells succeed and not be useless more than 50% of the time. I have had way too many fights where my decsision to cast some spell made me lose. If i get the thought that by casting magic missles i would have won then...i'm pissed
I would take concetration as an option, for example:
Bless w/o concentrating on it: 1 min duration 1d4-1 bonus to attack/save
Bless w concentration: 1 min duration and a stable +2 or +3 on the rolls. Concetrating on something usually gives more control.
The spells are simply not useful enough to have those restrictions and from playing those games for years now i have never felt those spells to be too powerful. Sometimes one spell can change the whole fight, sometimes it's just a fart in the wind...it's magic
Again, just my opinion.
