lost+found is still used on OpenBSD, seems it is created when needed. Only /home has that directory on my system. IIRC, it was created when a kernel panic happened a few releases ago. Plus some files were placed in it when fsck executed on /home
Same, it's only in /home on my system also. Also /home is pretty much the only directory where I see fsck needing to do a lot of recovery after a power failure. Makes sense I guess, because that's where processes such as web browsers are likely to have lots of files open in RW mode.
