Is linux bad? Is git bad? Your argument needs a little more development.

Linux is only a monoculture on the server. Server-side applications will sometimes use Linux -specific features but generally are written to be ported to other POSIX systems with little work.

Of course the git monoculture is bad. Have you seen how many people complain about git on Twitter?

linux isn't a monoculture at all

assuming you know about Windows and OS X and are just talking about servers, there's still the BSDs and Solaris and AIX. a good deal of software is written to just assume a reasonably POSIX-compliant environment, precisely because linux is not the only server OS.

unix-like operating systems are something of a monoculture and that IS very bad, because OS design is basically stuck in 1973

>Is git bad?

yes and anyone who says otherwise is numb to the pain