[monob]

Kernels aren't any more important than compilers, xorg, user space utilities and so on. That Linux managed to get its name on the whole stack doesn't mean much. You might as well be complaining that linux distributions are vulnerable to power outages.

If anything the major distributions are defined by their package managers, of which there is a large and healthy number - aptitude, dnf, pacman, protage, and a heap of weird and wonderful other ones with minuscule usage.