I think the lack of linux gui software was a comment on why a linux user wouldn't find this a compelling reason to switch not a comparison of the software available on each platform.

Personally I think someone interested in graphics/cad/audio production might find something compelling even if alternatives exist on linux for the above. I don't see much in the way of gui softare that anyone would care for as a developer. You can bring up visual studio if you like but I don't find it compelling.