Major distros backport security fixes. I'd say improved hardware support is 90% the reason to upgrade to a new kernel. Algorithmic improvements (like bfq) and n

Major distros backport security fixes. I'd say improved hardware support is 90% the reason to upgrade to a new kernel. Algorithmic improvements (like bfq) and new syscalls/subsystems are infrequent and one might not be able to make use of them immediately unless libs/userland adapt quickly.