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How does bcachefs deal with laptops just dying due to lack of power and then fsck and recover on boot?

Works fine. Been using it on my laptop for ~7 years, users say it's solid w.r.t. power failure too.

Awesome, can't wait for this to become linux's best filesystem.

Apparently, just fine. On paper, do a quick check and clean on mount. There are mount options for full check, degraded and recovery modes. About the paper https://bcachefs.org/bcachefs-principles-of-operation.pdf