What's stopping the user from installing those 3rd party additions?
Nothing. The fact is that blitzmax comes as-is without support for anything truly useful AS IS.
As Flameduck said:
No persistence framework, no regular expressions, no XML support, no multithreading, no proper unit test framework, no deployment tools, and so on.
None without the additions from the users. The users seem to be supplying everything, like a P2P language. This is only because mark doesn't support his own products that everyone else has to do everything. Yet no one complains about that, only about the things we CANNOT do because it is closed source.
If Bmax+MaxGUI comes with a GUI editor can be considered an 'application language'?
Switch MaxGUI with wxMax, and you have an application language =P
MaxGUI is a complete waste of time and money if you're trying to write tools/applications. And its still fairly useless for games. But mark wanted to re-invent that wheel too.