Adywan's intention was to bring the movies into the present so that the Star Wars saga could look more uniform in its visual style. His intention was to create an alternate special edition, not to replace Star Wars or to restore it to its 1970s state, which has already been done.
His changes had logic behind them, and many of them fixed mistakes with the movies, or helped make the movie more visually consistent with the prequels. The SE left many errors as is, and added many silly things that weren't necessary or wanted.
Okay, Why didn't he just fix the mistakes of the originals and make the prequels more in style with the OT rather than the other way round.