Being a support person, if I was rich enough to frivolously buy systems, I'd have at least one of each as a reference system. Yes, I know, vms, but that's for saving money/space. Especially MAC I'd have some hardware too. Definitely not a main system though. I currently have a broken Mac and a cheap chromebook for that reason, though due to being broken the Mac is rather useless now. When it worked I often used it to help test/troubleshooting customer stuff.