I can agree on some points and am concerned for healers. Blizzard’s UI is clunky. Like stated healing takes special mods to do well the main thing being customizable raid frames and buff/debuff indicators.
While I don’t think Blizzard will get it 100% right they will get 90% I think, maybe this is me being optimistic and hopeful.
I hope that the changes Blizzard makes to the UI and classes works, and you won’t need all that information that is currently required.
A large part of addons outside of what they did for combat was the visual customization. I think this is what is going to be hit extremely hard. Some of us have been using the same “style” for 15 years+ and while the new UI/interface might tell us the same information it will be completely foreign because it doesn’t look familiar, and that will alienate players at an unprecedented level.