[astrodust]

I mean with their respective UNIX-like operating systems.

There was a time when you'd find server rooms with a mix of AIX, HPUX, IRIX, SunOS, VMS, A/UX, and Netware and that was considered normal. In an academic environment you'd have someone running Plan9 or BSD some other quirky thing as well just because.

Then Windows and Linux came along and started to kill off this diversity one system at a time.