Vehemently agree. Monoculture is a huge risk to IT generally right now. I love Linux and must use it for some things, because nothing else is really supported, but I really worry about a world where all the servers run Linux.
I think the thing I miss most about the 90s and early 00s was that different unix-like systems took big, bold, and divergent approaches. Computing felt less “nailed down”... like there were more possibilities.