It might not be a matter of risk balance. MacOS 10.9 was pretty much when Apple jumped the shark. That was the last version I ran before switching back to Lin

It might not be a matter of risk balance. MacOS 10.9 was pretty much when Apple jumped the shark. That was the last version I ran before switching back to Linux, and I ran it pretty damn long in the tooth as well -- until ~2018ish. I still have a few VM images with MacOS 10.9 that I spin up from time to time in order to run commercial software like Adobe Acrobat.