archangel nailed it. While this isn't the only cause for why we're seeing this, it certainly is one reason.

A simple example:

One of the types of apps you can build with our tool is Python/PyGTK apps. The root benefit here is that, because Python is interpreted, there is no compile time -- when you click "Run" you instantly get to start testing your app out.

Because Python and PyGTK are readily available in just about every distro's repo, this is never an issue. But, on the flip-side, setting up Python/GTK/PyGTK on Win/Mac can be a bit of a nightmare even for the nerdiest among us.

(We provide our "HTML5" web app option as the default option on Mac and Win for this very reason... But, even then, we still get support requests on trouble-shooting someone's Mac where PyGTK just won't work quite right.)