If something crashes on SFS in the "right" moment, you loose the entire partition and not only a few files.
Reminds me then of PFS3

I seem to be the only PFS3 user for which loss of the partition was not 'if' but 'when'; I did a study one time documenting how long the 'when' took, but never put the results together. And, this was a sample of one (machine), so it could have been an intermittent hardware problem. I certainly am not advocating them, but for all their well known drawbacks, in 23 years, I have not lost one file in OFS or FFS filesystems. Sometimes I did need to use DiskSalv to be able to claim this.