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If Linux drops BCacheFS, it's dead. Let's be honest, nobody would be using anything but ZFS if it was in tree - not having it first-party is what keeps Btrfs alive. If you have to install it from external sources than you're probably better off simply installing ZFS to begin with.

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> nobody would be using anything but ZFS if it was in tree

I'd pick xfs anytime.

I don't know if it was already fixed, but ~1y ago had a really miserable experience using ZFS on my NVMe drives, zfs is like 100x slower in random read. And hey, I have fancy SSDs for a reason!

Yeah, but XFS has literally a fifth of the functionality ZFS has. If you need ZFS features you're basically forced to pick between ZFS or Btrfs, the former being vastly more stable.

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