Systemd likes to break standards. That’s a big reason
What standards? The old init systems were a loose collection of shell scripts that were wildly different on every distro. Other tools like sudo also broke the established standards of the time, before it you had to login as root with the root password.
Even gnome and KDE have their own themeing standards as well as other ways of doing things. Even network manager is its own standard not following things that came before it. Then there are flatpack, snaps and app images. Not to mention deb vs rpm vs pacman vs nix package formats. Loads of things in Linux userland have broken or evolved the standards of oldern times.
Systemd breaks its own standards. Oh, were you making a replacement for this component of systemd that does some things the systemd version doesn’t? Well the latest version of systemd just changed the Unix socket protocol that it uses to communicate with the rest of systemd from text based to binary. Sorry for the lack of warning.
@AVincentInSpace @nous I’ve always disliked the arrogance of the lead Dev & the inexorable incremental usurping of Linux functionality. I’m deeply uncomfortable with so much being absorbed into a big binary black box