I have successfully installed Manjaro 21.1.2 with BTRFS a couple of times.
FYI
- The PC I am currently on runs BTRFS on an encrypted partition, using an encrypted home too.
- Snapshots entries get automatically added to the GRUB menu after any system update, though I have not yet used any of them atm.
In my opinion it works just out of the box and it seems quite well managed and proposed. HTH!