Yeah, it doesn't make much sense to upgrade old Amigas ... but since when has that mattered?
I have all sorts of Amigas (NG and Classic) but they all have their own uses, so I use whichever I want at a time. At the moment I'm playing with PowerPC MacOS 8.6 on my A4000 - just because I can. Not because I especially want to run MacOS, but because I like tinkering with it. There's a great sense of satisfaction from getting old machines to run stuff they were never designed to, and that's what you get from running AmigaOS - the ability to tinker and play around. Games are good but limiting; when you're messing around with the OS you can be creative and push boundaries. That's where the fun is for me.
So stick to AmigaOS; you can always install a Mac emulator or a PC bridgeboard if you want to run esoteric OSes, and it's still in your beloved A2000. Best of both worlds.
