What confuses me the most is the kernel goes actually to great lengths not to break userspace, but if you rely on anything else than the kernel stuff breaks all the time, and distributions never update a released version to a newer kernel but just patch old kernels for years. So why do the kernel developers even bother?

Zig is proposing the opposite problem: future versions of windows wont run even trivial zig programs from today.

I can tell you that old Linux binaries run just fine on current distros.

Looking at how many times you repeated your misunderstanding in this thread it's clear that, not only do you not understand the solution, you don't understand the problem either.