I'll give you a good example. Microsoft Office has a Windows Version and a Mac Version. They LOOK very much alike.
I don't mean to sound offensive, however Microsoft is a multi-billion dollar corporation that spands its offices throughout the world. Although GT is even more awesome than Microsoft ever could be (for so many wonderful reasons), due to the sheer difference in size, resources, and funding, it is not always possible to support more than the average mainstreem user's typical configuration.
That being said however, I'm sure that a lot of that also has to do with the little known fact that Microsoft owns 51% of Apple.