Well, it's Archlinux, and the most basic usage pattern is to use "pacman -Syu", which updates everything (useful for updating your programs), including the kernel.
There is a kernel-lts packages that doesn't update as often, so you won't need to recompile every time.
In Arch, failing to regularly update breaks your system. Also, regularly updating your system will definitely break it at some point (bleeding-edge dontcha know). The official position is that it's your own damn fault for upgrading or not upgrading, as the case may be.