Sadrik
First Post
If one were to regard 3.x style buffing as a feature rather than a bug I would drop the Concentration descriptor from all the spells except those that included an action for additional effect (e.g. Moonbeam, Flaming Sphere) or that have a different effect if Concentration is maintained (e.g. Wall of Stone).
Otherwise the other limitations to stacking spells apply (less slots, non-scaling durations).
I think 3.5 concentration is seen as a feature for many people though and 5e concentration is seen as a bug. Hence this thread. I would think that you would want to go somewhere in between, at least from my perspective. Some interesting ideas have been brought out in this thread on how to do it.
I think the most bang for buck is this variant:
Each character concentrates on buffs they have on them. Someone casts invisibility on you or you drink a potion of invisibility, you concentrate on the buff.
In addition to that buff slot, caster's can concentrate on one debuffs or area spell s per the normal concentration rules.
So a wizard might have a wall of force and a blur spell on himself.