Potentialy dumb question here, is there any benefit to using btrfs on a non system disk? I'm fairly ignorant on file systems, asfaik btrfs largest benefit is snapshotting, not sure of anyothers.
When I worked through some AutoYaST setups for Leap 15.5 the default disk setup did BTRFS across the line, though that could definitely differ from doing the install interactively.