The worst part about all this is that despite the complete rework, they left Fester and Energy Drain in place, even though they don't fit with the new system at all. The summoner rework doesn't even have proper resource management; it's just pressing Energy Drain every 60 seconds.

They didn't even bother to remove the egi coefficient, so all the attacks that are commands to Demi such as Enkindle Solar Bahamut/Bahamut/Phoenix or Aerial Blast, Earthen Fury, and Inferno don't have the actual power displayed.
All these attacks still suffer from the egi coefficient, which reduces the total spell potency by about 10%. For example, the displayed potency of Enkindle Solar Bahamut is 1600, but its actual pot is more like 1440.
Enkindle Phoenix and Bahamut drop from 1300 to around 1170.

It was completely dumb to leave behind dusty relics from the past like the egi coefficient or Energy Drain, especially when doubling its cooldown from 30s to 60s for 2 Aetherflow stacks.

In Dawntrail, they didn't make any effort either; they had the chance to rename Fester to something more fitting with the new summoner kit, but they decided to call the spell Necrotize, even though we no longer have any DoTs.