Technically Corruption is replaced by Hand of Gul’dan, and, if Curses can tag a mob as Corruption could, then that’s not real problem.
I think to avoid becoming an Eye of Gul’dan simulator (as Kalamazi aptly put it), a choice node between Bilescourge Bombers and, maybe. Thal’kiel’s Consumption to give us an extra button to press should be added.
Still not convinced that Summon Felguard as a talent should be a thing.
I mean, when you get a new demon, it seems a no-brainer that you’d start using it (maybe they could have an on-screen flash icon showing Felguard has been added).
Also, talent descriptions basically tell you that they enhance Felguard. Short of naming the talents Felguard Enhancement one, two and three, I’m not sure how more simple they can make it!