Thunder removal and Holy nerfs were whatever....it's mostly a nerf to speedruns.
Medica II nerf is unacceptable. This game strongly encourages keeping people topped off rather than triage healing. Especially right when Titan hits phase 5. Other examples include keeping people topped off on ADS in case somebody lags and gets hit by a laser (on low hp targets the AOE ticks can kill right after), etc etc.
Moreover, it is a straight nerf to tank healing, as the HoT was very useful coupled with Regen on tanks.