“Improved CGIs” is part of the problem. The original effects didn't have any CGI… it didn't exist yet.
The original effects as seen in 1977, 1980, and 1983 respectively were ground-breaking for their era. Nobody had seen anything like what these movies were showing them before, and they played a significant role in the world-building of the Star Wars.
You can argue that some of the revisions are good ones, but they are not the effects that changed what cinema looked like.