> Back then it was either lightning fast, jank-free, and intuitive -- or else it doesn't ship.

That's kinda rose tinted history. System 7 (1990s Mac OS) for example crashed and locked up a whole lot, in my experience. The UI was fantastic and had great consistency, and the developer docs were of a quality that would blow minds today. But the software was not as solid as all that.

Windows was the same or maybe worse at the time. BSOD was common and a nightly reboot was a good idea until NT/Win2000. Solaris and BSD would have months of uptime on similar hardware, so it was a software problem. PC OSes were just not there yet. Windows 2000, OSX, and Linux gradually fixed that.

That's all basic uptime. The UI design drift of MacOS is another story.