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> BTW: Even SLES SuseLinux Enterprise says use XFS for data btrfs just for the OS i wonder why

Because XFS is far quicker for server-related software such as databases and virtual machines, which are weak points on btrfs due to its COW model.

Doesn't "chattr +C" give you back that performance, while still letting you keep the rest of the benefits of Btrfs?

Nodatacow is an ugly hack because it disables btrfs's core features for the affected data. It also should not be used with raid1.

Yeah and maybe additionally you want to keep your data and have a stable filesystem for them ;)