IIUC the ask (I have a hard time wrapping my head around zfs vernacular), btrfs allows this at least in some cases. If you can convince btrfs balance to not us

IIUC the ask (I have a hard time wrapping my head around zfs vernacular), btrfs allows this at least in some cases. If you can convince btrfs balance to not use the dev to remove it will simply rebalance data to the other devs and then you can btrfs device remove.