They basically made tanks a dps class for people who can't handle complex dps rotations. Other than poping a cooldown for tankbusters tanks tend to have even less mechanics to deal with, even compared to dps classes.
I guess the number of people playing tanks was low and they went fuck it let's just make tanks dps, like they are today.
Removing the enmity management is akin to having all healing gcds removed form healers and giving them a pet that passively heals all other people so they can focus on dps. That's tanking today.
People defending the enmity removal are people who just want to play a dps but probably can't handle it, or they just want a shorter queue for instances.