I'd say Seraph doesn't even need to be deleted, just change it into Rouse so there's no longer the weird fairy ability lockout. This can even keep Consolation as a thing too, but man I still have no idea why they decided to make the fairy have an entirely separate entity that causes ghosting and locks you out of stuff like Fey Blessing and Fey Union... what was the reasoning?

If Dissipation had to go, I'd like to see it be replaced with both Quickened Aetherflow (since the lost Aetherflow from Dissipation adds up) as a trait and then a DoT like Miasma or something too.
Really the only thing though I disagree with is Tri-Disaster, because DoT maintenance is ruined if you have a button that applies your DoTs for you. At that point, there's no difference between having 1 DoT or multiple if the management is just in one button; this is also why BRD's DoTs are boring because they're both refreshed with Iron Jaws and then you never hit their actual buttons again. It's also why I think ShB SMN was not a "DoT job" because Miasma III and Bio III were both on 30s timers, both the same potency, and were only hardcasted once every 2 minutes in the rotation and were otherwise just reapplied with Tri-Disaster. True DoT management should be on different timers to keep you paying attention and aware of where they're at while you're handling other things, in my opinion.

I like the idea of giving Energy Drain the old Fester mechanic though, it'd be cool if maybe instead of just a flat potency gain it was something like "If Bio is active, Energy Drain restores HP, if Bio & Miasma are active, Energy Drain restores HP and MP"