I speak from my experience, but I didn't even train much for T7 or T8. I just watched a video, got a solid grasp of the mechanics and dived in. Cleared T8 the second night I tried it and I don't remember T7 but it wasn't too far behind. And I also play more casually compared to pre-2.1.
These fights are easily scripted, if you are DPS in T7 all you have to do is to pay attention to 2 mechanics (Ok and fireballs, but I think that happened only once to me) And honestly, I've raised enough people in T7 to know that unless MT or OT die, you can recover if you are fast enough.
I'm not trying to sound elitist or anything, it's just how I perceive scripted fights. It's basically learning a new dance every time.
That's why I'm not interested in T9 particularity, It's not much of atest of my ability, but how much I can memorize these 1HK mechanics (also new gears in 3 months)
Ramuh is sleep inducing if you have a BRD baiting in the water and the healers know when to grap orbs.