XDG is also doing it. Which Linux distro doesn't follow XDG spec?

It won't because none of the alternative inits are better

I don’t know why this would kill systemd

Most distos have already made the choice to accept systemd knowing it'd be filled with feature creep and bloat, this is basically just getting more of what they asked for. Nearly everyone is going to have to find someplace to implement this bullshit age verification nonsense though. I don't expect saner minds to prevail anytime soon.