Re: 2), there are significant parts of OS X that seem to either check for HFS+ or rely on its implementation and bugs, and those things don't work properly on o

Re: 2), there are significant parts of OS X that seem to either check for HFS+ or rely on its implementation and bugs, and those things don't work properly on other filesystems. OpenZFS, for instance, still doesn't work with Spotlight, on which a surprising number of things depend these days. https://openzfsonosx.org/wiki/FAQ#Limitations https://openzfsonosx.org/wiki/FAQ#Limitations If you want to use all the software features of your Mac, your only option is HFS+.