Anustart:
For the record, Dispel does not remove stats buffs like Wall, Shout, etc. That belongs to something called "Ultimate Dispel", which is (thankfully) very rare.
RPH:
I spent 5 hours on Greg. I thought I had a sub-30 team, or at least a fairly easy 100% team, and tried following a couple vids that were "close" to what I had, and I simply could. Not. Win. I was maybe 2-3 relics off from a couple sub-30 vids, only to find that what was missing was crucial and I had nothing to replace them. I actually got that 87% on my second try in about an hour or so, and spent another 3 hours on a different trying and failing to even get that far.
Jenova I "knew" I had a sub-30 team. But again, even following a vid that was close, having one less relic made the fight more of a slog than I expected. I managed to win in 35:45 after two 2 hour sessions on different nights and thought I could go no further. Then the Sephiroth USB2 banner came out, I got Cloud Glint/LMR2, and found another vid that used Yuffie as chain builder and managed to (barely) sub-30 with that after another 5 straight hours of attempts.
Basically, I felt that my VII realm is so strong, but to only barely sub-30, meant that the effort expended wasn't worth the toll on my life and psyche. Yeah, I had (almost) everything for a realm and that was enough to scrape by the highest difficulty (I'm of the opinion that if you have just about everything for a hard fight, it should be comfortable and not hair-pullingly hard; you definitely should not need to have whale-level relics just to barely win) - either the fight is too hard, I'm too incompetent, or both. I don't need that additional stress in my life, especially since no other realm in FFRK is as close to stacked as VII or even V for me, so I stopped.
And even with better tools (5* magicites and/or additional relics), I haven't felt the urge to go back and try any of the D??? Torments. I keep thinking, "Maybe I'll give this one a try", then I fail to sub-30 the D280 with a realm team (usually resort to Cloud/Zack and 3 realm schmoes to sub-30 D280) and I'm brought back to reality and say "Nah. Maybe next year".