Some desktop app developers don't see why they should maintain several versions of their app, put out a single Java GUI across platforms, and get shunned for it

Some desktop app developers don't see why they should maintain several versions of their app, put out a single Java GUI across platforms, and get shunned for it. (Granted, web look and feel on mobile likely won't be that bad). I think this issue boils down to perceived ROI on development costs (and 'push web technologies' agenda in Google's case) rather than quality.