You’re not the only one who noticed this difference, there are also users on Reddit: https://www.reddit.com/r/btrfs/comments/lizj7o/use_btrfs_on_smr_drives/
Btrfs since kernel 5.12 started support for “Zoned” devices but I don’t know if it also covers “SMR” devices: https://btrfs.readthedocs.io/en/latest/Zoned-mode.html