Yoshi-P: "If you want more engaging content, go play Ultimate"

[Seraphor]

Anyone else notice a pattern where the players who spout this kind of stuff on the forums have a pretty recent join date? Where their characters don't seem to have seasonal mounts before 2021? Hmm.

Nah, I second it.
Any dps rotation will end up taking precedence, and suddenly you'll have every healer unable to heal because they're in the middle of their combo.
SGE is the peak of healer dps rotations, it has a couple of CDs and oGCDs to break up the Dosis/Dyskrasia spam and that's enough. Anything more would be overkill.
They should absolutely bring WHM and SCH up to that level though and AST has cards so to keep it busy.