I agree it's pointless -- you'd just be
getting a screenshot of
someone else's VST plugin.
The point as I see it is to prove that the VSTis are rendered properly
in a Linux environment, since they are highly visual tools. To see a
couple of them floating around a KDE desktop makes the point for
people who might not appreciate the implication of your code.
I'd expect many serious audio users and musicians have a far higher
investment in VST plugins and VSTi's than they do in Windows itself.
Cheers
Daniel