Is there any technical reason why it is not supported?
Also, just for curiosity, and without condoning what the company is doing, is there a good reason to use btrfs for a device like that? I was thinking that good filesystem repair facilities are important once you store a lot of data, and btrfs is inferior to ext4 on this? I find btrfs is fantastic if you have, say, a bunch of Yocto images, or a large video you are working on, and you want to quickly create and erase snapshots of many gigabytes of data, but what is the advantage here?
Also, just for curiosity, and without condoning what the company is doing, is there a good reason to use btrfs for a device like that? I was thinking that good filesystem repair facilities are important once you store a lot of data, and btrfs is inferior to ext4 on this? I find btrfs is fantastic if you have, say, a bunch of Yocto images, or a large video you are working on, and you want to quickly create and erase snapshots of many gigabytes of data, but what is the advantage here?