You mean a windows monoculture?
Unix stuff has only recently been "in the norm" for dev related workflows, it used to be entirely Windows only.
Same with office workflows, games (both playing and developing), graphics, etc.
Unix is the rebel here. It is bringing the diversity.
(Currently my workplace is probably 80% Mac, 19% Linux, 1% Windows, but I can see their point that it would be a lot easier to administrate if they were a monoculture of Mac).