And to an extent I always considered visually pleasing UIs to be a big strength of blizzard. Their Icons are so crisp (I'm actually annoyed we don't get to see most quest items anymore which go into an invisible bag of sorts because they DO have icons in the data and someone actually makes the effort to pick something fitting) and the UI usually frames their games well.
Moving to a lightweight UI effectively just gives me a WORSE version of what I can get with addons. If I am getting it from Blizzard with much less options I'd at least like to get better visuals