Checking the bus factor:

Btrfs regulars:

- 1 from Meta

- 1 from Oracle

- 4 from SuSe

- 2 from WDC

bcachefs:

- Kent Overstreet

And Btrfs still does not have a RAID-5/6 that they themselves recommend for usage:

* https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#man-b...

What have they been doing for the last decade(+)?

Might end in a new bcachefs fork beeing included back into mainline. If companies sponsor a few fulltime devs working on the new fork, we finally might have a stable enterprise ready CoW filesystem.