openSUSE also remains one of the only distributions that have automatic Btrfs snapshots setup out of the box. I am very surprised other distributions have not done the same. Especially Fedora, since they use Btrfs already.
IIRC, it was related to Fedora Atomic. Out of the box, Fedora Atomic offers functionality that's very close to what you'd expect from Btrfs snapshots. It doesn't use Snapper, but instead relies on (rpm-)ostree; at least, that's my understanding of it. So, in order to make Fedora Atomic more palatable and attractive, this feature was not directly built into Fedora. Furthermore, I wouldn't be surprised if 'politics' play a role in this; Snapper is kinda like openSUSE's project. While Fedora Atomic's implementation is Fedora's take. Unfortunately, it happens to be (by design) not available on traditional Fedora.