So your point is distros provide dedicated tooling for simple recompiling of kernel (that is different from other distro packages), but do not have dedicated to

So your point is distros provide dedicated tooling for simple recompiling of kernel (that is different from other distro packages), but do not have dedicated tooling for systemd? Fair point, but does not address the kernel being orders of magnitude bigger monolith than systemd. Say you disabled LSM, rebuilt, now all stuff that requires Selinux does not work. Now what?