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Classic Mac OS was buggy by design - it didn't have multitasking and memory protection, it was single user... Windows had that same problem before 2000 (well, NT 4, but not many people used that).
I use OS X daily and I use Windows 7 daily. I have far fewer issues with OS X for whatever reason that may be. My computers don't magically reboot or bluescreen nearly as much. It might happen every 6 months at the most, where with Windows it probably happens every 2 months.
I think it was flipped on after an update, but why would I even want to be able to enable that mode on a laptop without a touchscreen?
Because of Apple making OSX Unix based, it cut into sales of other Unix companies like SGI, and also GNU/Linux cut into sales of SGI and others as well.
But making OSX Unix based solved a lot of problems that Classic MacOS had that they couldn't solve.
My pc is my beater car, and it needs repair--regularly.
My Mac is the classic car in the garage, that only gets used for work, or safe places.
Windows, not so much. The only stability issues I've had with windows have been related to poor drivers, almost exclusively from nVidia or ATI/AMD. The equivalent hardware for Apple machines either didn't exist at the time, or was running much less ambitious drivers.
I probably have more issues with my Macbook Air (relating to sleep, hibernate, and wake-up) than I do with my Windows machines these days.
Compare that with the _desktop_ Windows 7 machine. It first crashed intermittently (memory failures), but after I changed the motherboard, it has not crashed at all. But then again, I am not using, for example, the most cutting-edge graphic drivers.
I remember quite some crashes during the Windows XP times, but I've since taken a more conservative approach to hardware and drivers.
You try fitting all that plus a GUI those constraints.
What's amazing is that it had the features it had and that it worked at all.
Both provide GUIs and rudimentary Web browsers. QNX was full POSIX, too, although the demo disk didn't include a terminal.
Pity that nobody remembers Windows NT4, it was miles better than OS7. I stopped using mac altogheter after starting to use it.