So with classes being designed around 2m burst windows and based on their ‘support’ what happens when those savage dungeons hit and some of those aspects are useless?

Considering you can rez someone in normal means then the whole RDM/Sum advantage is lost and they have nothing to show for it in that content.

Not only that but with the natural downtime that exists between pulls some more burst focused classes can benefit a lot more because their low damage window could be spend during said downtime if it aligns with it letting them start with a huge burst on next pull.

And have they ever even balanced the aoe capabilities of all classes?

Have they mentioned anything regarding class balance and how the savage dungeons will play into it?