cephfs is clearly marked as not for production. It still has more than its fair share of bugs and has single points of failure. From the very top of the docs page on ceph FS:

"Important CephFS currently lacks a robust ‘fsck’ check and repair function. Please use caution when storing important data as the disaster recovery tools are still under development. For more information about using CephFS today, see CephFS for early adopters"

RedHat is focusing on making the block and object storage bulletproof. They're content to let the opensource side twiddle away on ceph FS.