We know full well that it's nigh impossible to not have some sort of graphics degradation when porting from PC to console. Despite the fact that consoles are more powerful and PC-like than ever before, they still aren't quite as powerful as their desktop cousins. At least not yet.
Back in the days of the Elite Dangerous beta, some users experienced a significant drop in graphical quality, namely in lighting and shading, just after updating. With the jump to a new console and architecture, such an issue could once again arise -- and we don't want to see it fly under the radar without getting fixed.