XFS isn't everything. The checker for XFS requires something like 1GB of RAM for each 1TB of disk space. This doesn't sound bad until you want to install a machine with 96TB of disk and 64GB of RAM. You then find out that the ext4 user space tools can't init a disk that big and XFS can't check a disk that big. :(
Using xfs_repair -n is a workaround, but still (IMHO) a hack.