ED is cancer.
Some powers only accept one type of enhancement (especially defensive powers tanks/melee rely on). ED nerfed these powers into oblivion, and ED was something that originally made me quit playing and move on to another game due to nobody wanting me in a team anymore. I got tired of being punished for having powers I needed to survive that only used one enhancement type.
If we get punished for single type powers, why allow us to 6 slot them in the first place? Meanwhile, multi enhancement powers can still diversify and be useful with 6 full slots.
ED also led to a lot of tanks being all but useless and having trouble finding teams in the lower to mid levels of the game. As a SS/INV tank back in the day, ED sucked. Before ED, I could get in teams all day long and my SG was always happy to have me tank because I got the job done. After ED, teams didn't need me because the big bug Kheldians could do a better job and I couldn't take the hits anymore.
If they ever find a way to get rid of it, I won't miss it. I didn't like my defense potential being nerfed just because the developers decided to dial back returns on single enhancement abilities. If the devs allow me to 6 slot a damage resist power that only takes damage resist enhancements, I want the numbers I should be getting after investing the slots and the money into them.
Any tank that isn't maximizing their defense potential isn't doing their job, and ED made it harder to do that job.
I got tired of logging in just to sit on the yellow line looking for teams that didn't need me, so I canceled my sub and quit playing.
This time around with Homecoming, I made a point to not main a tank just in case ED was still in play. If I want to play rather than sit on the sidelines or solo, I log in a healer.
I'm glad that you guys like Enhancement Diversification, but it never did me any favors back in the day, and I absolutely hate the very thought of it.