Opengl

Riddle me this:

If OpenGL is supposed to be just as good if not even better than Direct3D (Not talking about DirectX here), then why don't developers use OpenGL to program their games generating some extra sales on GNU/Linux and Macintosh?

Most people use some sort of IDE that looks up the function prototype and highlights the current function/argument, so getting the order wrong is rarely an issue.
It is problematic to require an external tool just to compensate for the problems of a language or library design. Most people recognize this, and just hold their nose when they have to use the language and/or tools. But not you!