I think the issue with Swing was that is was in a bit of an uncanny valley. If all controls were custom it wouldn't look strange. Visual Basic was very... well

I think the issue with Swing was that is was in a bit of an uncanny valley. If all controls were custom it wouldn't look strange. Visual Basic was very... well, "basic", so it looked normal. Some tools like CCleaner and a lot of Antiviruses had fully custom looks, but didn't look out of place, because they were too different. JavaFX looks fine, though.