[IshKebab]

TL;DR: maintaining a stable driver ABI is more work because you have to deal with backwards compatibility, and it mainly benefits vendors that don't make their drivers open source.

So the Linux devs are really against it both from a lack of resources point of view, and from an ideological "we hate closed source" point of view.

Unfortunately, most vendors with closed source drivers don't give a shit about ideology and simply provide binaries for very specific Linux releases. That means users end up getting screwed because they are stuck on those old Linux versions and can't upgrade.

The Linux devs have this strange idea that vendors will see this situation as bad and decide that the best option is to open source their code, but that never happens. Even Google couldn't get them to do that. This is one of the main reasons that Android OS updates are not easy and universal.