This issue is far from all others and could be described as whim.

But.

Too many of my familiars from all the web talks that current default skin is mood. Of course it is far from 10-years-ago swing components, but in modern world of Flex\JavaScript\Silverlight ... it is really looks not great.

You'll say that developer can "easily" change skin to any he likes.

But most of developers haven't keen graphic eye and can't hire cool designer for small projects.

Wow-effect from many simple apps could really push adoption of JavaFX2 ( to be honest, it is very weak for now, despite titanic work of many brilliant developers )