The common criticism of ROTJ is that it’s tonally lightweight and ‘kiddie’ in comparison to the previous two films.
Critics say act 1 muppets, act 2 teddy bears, and its not until act 3 that the film takes itself half seriously.
I believe that restoring the Vader / Luke deleted scene would help redress that somewhat, by adding more substance and gravitas to the earlier part of the film.
In this age where we are seeing grainy scratched old photographs turned pristine I’d have some hope the technology exists, and if anyone can upscale and improve the visual quality it would be yourself Adrian. It would be quite a coup were it possible.