lichmaster
Hero
Not really: you need one caster per spell. The group may not even have more than one caster, and even in that case, you can have one concentration spell per caster at most.You can have all of the crazy spell combos you want; you just need multiple casters, which I think encourages teamwork and benefits the game.
In my next short campaign I'll experiment with lifting this cap on concentration to 1+1/2 proficiency bonus, i.e. casters of level 1 to 4 can concentrate on up to 2 spells simultaneously, casters of level 5-8 on 3, etc.
Or maybe just 1/2 proficiency, we'll see.
I'm quite confident it will make the game way more interesting