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Well.. here's hoping that the sheer number of Rpi punters out there swells that number by making it a nice easy entry level for people to get a taste of it.
Personally.. I think AmigaOS is the pinnacle of OS dev and has a special place in my heart. RiscOS is still nice though
An OS still without memory protection (so, in a a way, without proper multitasking - it relies on good behaviour of applications) is a pinnacle of OS development for you?... O_o
I suppose the positive aspect of it is it forces you to write good code.
Seriously dude Get out of the 90's. That's when they introduced "Enforcer" .. which if you have a CPU with an mmu eg.. 020+68851 or a non-EC anything later enables mmu protection.
Yes, you can run without memory protection. No I don't think it's wise and don't. Yes, I do think that AmigaOS, VMS and OS/400 are the pinnacle of OS dev