Does btrfs support native encryption?
I use LUKS / dm-crypt on entire drive partitions. Did that with ZFS too, and by the time ZFS got this feature I was already planning my migration to btrfs.
I like encrypting with LUKS, because I can have a drive configured with mine and my wife's password. Either one of us can take that drive, plug it in, and Gnome will put a nice graphical prompt asking for a password, then decrypt the drive and mount the filesystem.
If I get hit by a bus, LUKS makes it much easier for my family to get access to important data without having to have that data sit around somewhere in plaintext.
The kernel fscrypt layer just needed a lot of refactoring first to support cow filesystems.
For me on Fedora, uptime is better and maintenance overhead is lower on btrfs.