I'm not sure "Linux" (by this I believe you mean Linux kernel and distros & open-source software) is hostile to the concept of proprietary drivers. There is only a small subset of users who are hostile to proprietary drivers. And I have no idea why you are suggesting Linux doesn't have a stable ABI.
Because for drivers, it doesn't and never did and never will as long as Linus has anything to say about it. This is in stark contrast to his position on userland ABI, which is so stable you can still run Motif.
