If Linux would add a stable kernel module API this wouldn't be a huge a problem and it would be easy for bcachefs to ship as a kernel module with his own independent release schedule.
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>FreeBSD (which is often invoked in these complaints) would have amdgpu for example.
In such a hypothetical FreeBSD could reimplement the stable API of Linux.
I worked for HP on storage drivers for a decade or so, and had their been a stable ABI, HP would have shipped proprietary storage drivers for everything. Even without a stable ABI, they shipped proprietary drivers at considerable effort, compiling for myriad different distro kernels. It was a nightmare, and good thing too, or there wouldn't be any open source drivers.