I think there's still a lot of artistry in modern cases. The Fractal Torrent one one that looks interesting and practical. The ITX and mATX market has a lot of new stuff after crowd funded cases like the Ghost and the SFF Time cases showed what was possible.

But the days of filling out drive bays seems gone. Everything is either about being super compact, cute and snug, or being big and elaborate display pieces with pipes and colors and RGB puke.