Quote Originally Posted by Ultimatecalibur View Post
They removed them for a very good reason: During HW (and even as early as ARR) the shear number of DoTs and debuffs applied at one time by characters participating in 24-man Raids, A-rank/S-rank hunts, and Daidem often exceeded the maximum number of visible debuffs and occasionally exceeded the maximum number of appliable debuffs on a target. Players could not tell if their DoTs/Debuff were up which caused sever losses in dps.

So the great DoT purge of Stormblood had a very good reason behind it.
That's an issue with UI design not class design.