What exactly about the Amiga FFS made it more fault tolerant?

I’m not sure comparing the file system on a single user workstation where disk is probably quiescent most of the time to the file system used on a busy server is really apples to apples. The Wikipedia article on the Amiga FFS makes it sound like it was an early journaled file system, but not technically superior to anything developed since. It plays back the journal if not shut down cleanly. All modern filesystems do that.

OpenBSD uses FFS btw (not the same FFS as the Amiga).