Earlier quoted context omitted.
Systemd of course has had its share of issues. But a lot of also comes down as natural resistance of change by sysadmins, which is a well documented psychological phenomenom https://journals.sagepub.com/doi/full/10.2466/09.02.10.CP.1.... … and sysadmins tend to be at the deep end of the spectrum
It's not remotely unique to sysadmins. If anything, devs are worse. Have you seen how many Python 2 packages there still are out there? How often do we see opinions on HN that amount to "C > *" whenever Rust, Go, Java, C++, etc. are in the submission? That's the exact same "resistance to change". Change isn't a light switch. It doesn't go from 100% old to 100% new. Change is a long, slow, time consuming, and difficul…
Pretty much none. Can't say exactly how many, since http://py3readiness.org/ is dead.