i use slackware. the init system here is extremely easy and simple. (mostly shell scripts)

i see no reason to use systemd on my machine. it's an unnecessarily complex beast i can't fully understand myself.. i get it there's some useful features included but i don't need them. and i personally had issues with machines using systemd (waiting for some daemon to start with some timer going and hanging there, idk if it's a config issue but it was a vanilla debian box with barely anything changed)