I’m looking to trim out the unnecessary kernel firmware on my Tumbleweed install, but the YaST package manager throws an error that doing so will break the kernel-firmware-all package. Would it be safer to break the kernel-firmware-all package, or remove it?
Hi and welcome to the Forum 
Remove all, then lock (taboo) the ones you don’t need, then install the ones you do need You might want to use zypper from the command line for this? I also remove all the *-lang and plymouth packages and lock…
In YaST the description of kernel-firmware-all says “This package is a catch-all compatibility metapackage for providing all files that have been provided by kernel-firmware package.”
So if you do not need all kernel-firmware-packages you do not need **kernel-firmware-all **either.
Regards
susejunky