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.
Like it does with the userland API of Linux, which is stable: