To some extent the changes proposed (and indeed executed) by some editors are superficially superficial, in that some viewers may see it as merely adding decoration to an already visually rich artifact. When in fact they are doing a lot more by adding to the illusion of an engagingly plausible fantastic world in service of the story.
It is possible to go to a theatre and watch a play with minimal props, scenery or costume and still have a powerful evocation of a story but that's not what the majority of cinema is about and it's certainly not what these films are about.
The problem with a lot of modern cinema and this is particularly evident in Lucas' later Star Wars films is that they feel deep down superficial. Even really high levels of decoration can be functional but there is a trend for flashing spectacle at the audience to dazzle them into not noticing that there is a lot amiss with the integrity of the narrative. That might work on one viewing if the viewer isn't paying enough attention and the spectacle is significantly spectacular but that falls into dust on repeated viewing.
At their core Star Wars films are tales, in a classical sense, they are fables and fables are meant to be returned to.
While the characters exist within a fabulous tableau, their world needs to feel plausible to us not just for the first time but everytime we feel the need to return to those stories.
For their time the first two Star Wars films were amazing and I could watch them in their original form and forgive the little bumps and cracks in the fresco because they were made with a real feel for the sort of story they were trying to tell.
Editors like Ady when they approach those films are really just giving us an alternative view of an already impressive picture.
The other films are different, they don't really function as they should and approaching those films is more of an act of rebuilding than refreshing.
Sometimes that means shifting the sequence of events around which necessitates the reframing of scenes previously occupying a different place in the narrative, sometimes that means adjusting small details to remove destractions that take the viewer out of the scene, sometimes it means adding new elements which feel missing and a lot of that is subjective (which is why I don't think these films will ever be made perfect for everyone).
It's possible and clearly the case that people on these boards propose changes in service of the story which other people disagree with but the reason for proposing them should always be and usually is, to enhance the storytelling nature of these films.
Nobody should add (or remove) just for the sake of seeing something new.
There is enough in all these films to still say the same story but to do that story justice (even the PT can be saved with a lot of hard work, I wasn't before but now I'm convinced of it).
They may never be the films that everyone hoped they would be but I really do believe they could tell something approaching the story that Lucas seemed to want to tell but didn't, for all manner of reasons, achieve to tell.