Well the problem with Rot is that it punished melee players more than ranged. Before letting the ticks hit 0 (enrage if you like) was discovered as a method to clear turn 2, melee where being omitted from turn 2 parties because of the increased chances of wiping as opposed to all ranged. "Enrage" method allowed all DDs to do it equally.

That was the major issue of Rot. Posssibly Yoshi realized that which led to his decision to leave it as it is.