If they ever finish debian to use a single init system and actually have some consistency
They did finish Debian to use a single init system, it is called systemd and it sucks. If you install another init system you have to do a shitload of work to un-systemd it, which is why Devuan exists. They do that work for you. Debian USED to use a single init system (init and compatibles, you could switch between them freely without having to do anything else) but then they added systemd support in the name of GNOME support, at a time when GNOME popularity was waning and while systemd was particularly terrible software. This was frankly insane. Many of the gigantic bugs in systemd have been fixed but many others are wontfix, like early boot logging which doesn't work and forces you to use a debugger to figure out why your system won't boot.
TL;DR: They did exactly what you wanted and it was a terrible decision that set Debian back years and led to the creation of yet another Debian derivative to restore it to do things in the Unix way.