Maintaining 2 or 3 different init systems is non-trivial and companies do not want to support 3 different init systems for the next 10 years. It costs time and money, so they would rather have people work on things that actually matter instead.
I completely agree, however I think it would have been worth the effort, even if it where only to appear in Fedora. Definitely non-trivial, but could have been done when first integrating systemd.