What's "a lot" here, and are you sure that's still true? Because my suspicion is that it might have been true before FAANG sunk billons of R&D into Linux, but I would be shocked if Linux kernels cash at any rare worth noticing today. Although it's splitting hairs, really; when is the last time you saw any major kernel crash?

I've got Linux servers that have gone that long without rebooting (and some that are much longer!), but I generally view it as a bad thing and a failing on my part, and would feel the exact same way if I was still running illumos and freebsd servers. Software updates happen for a reason, even on BSD, and servers running for that long mean that they aren't getting those updates.