Aix, Atari, Amiga, Acorn, and BeOs were dead; Solaris, HP/UX, and NeXT were POSIX and had no applications except for highly specialised professional use cases; most of the rest were embedded platforms doing their own thing. None of them had any kind of meaningful market share. It was hell for Mac users because only the loyal developers from the previous decade remained. Windows was on something like 90% of home computers. I remember it very clearly, it was a Windows monoculture and it was fucking awful if you were on another platform.