Let's all think about way back in the day, where you HAD to wait for the team and if you went ahead you had stealth (and sometimes team teleport) or died.
Where mezz was harsh and "herding" was a thing. You know, "organisation", as they call it.
That was before masterminds, wasn't it? They really put the K in chaos.
It's a different game now, but specifically two of the difficult obstacles were never mitigated: Malta End Drain and Crey Invulnerability.
Because trash blows up so quickly, I think we need new varieties of those type of obstacles.