What exactly is the problem with Concentration? I have a paladin in my game now and even with concentration he doesn't seem to be lacking in power... or is there another issue at work here?
It's merely an issue with game style. Personally, I did not have a problem with multiple PCs stacking multiple buffs in 3E. It might have been a problem for some tables, but for me, only the durations were a problem.
Player one: "Ok, let's cast all of the one hour per level spells first, then the 10 minutes per level spells next, than the 1 minute per level spells, then the 1 minute spells. Now let's see, which spell is which?"
I don't see that problem occurring with 5E since as a general rule, most spells are either one hour (Hex or Hunter's Mark) or one minute (most of the rest).
I also think that this is a good thing for NPC casters to multi-buff and I hate the whole "Well, it's an NPC, it's allowed to work with different rules" concept. I like a world where the physics of magic work the same for PCs and NPCs alike. I want dragons or archmages to have 3 buff spells up to help thwart the plethora of stuff that PCs can throw at them.
I get the entire reason for the rule, I just think that it went too far into the "THOU SHALL NOT STACK BUFFS" territory.
If the rule is ok for people here, fine. No need to post 120 "I think the rule works great" posts. I'm looking more for ideas on how to allow a few concentration spells to work simultaneously, not for lengthy discussion on whether a given DM would do so or not; or alternatively, "why would you want to do that?".
For our table, 5 of the 6 PCs can cast spells and the 6th PC is probably the most optimized and powerful, so this is something that would benefit the entire group.