Source Incompatibilities in recent 8.X kernels

What is the logic in propagating source incompatibilities in subversion upgrades?

so beegfs has a kernel module that compiles against the installed kernel.

with the 8.5 kernel release a number of the rdma kernel symbols were renamed removing their ib_ prefix.

now with 8.6, kmap_types.h has been deleted altogether as a header file.

The Value of RHEL is the stability, but if our parallel storage doesn't work...
thats not stable- Why not push these updates to the RHEL8 -> RHEL9 transition...