But it probably has to change a lot for every major release, because so many things change. FreeBSD major releases have changes too, but a lot of the user interfaces are very stable and so the documentation can be too. Stable documentation allows time for it to be edited and revised to become better documentation, as well as developing quality translations.
https://news.ycombinator.com/item?id=47407895
Part of the problem is, too few committers. https://cgit.freebsd.org/doc/log/access?h=refs/internal/admi...
> as well as developing quality translations. …
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267274
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284875#c8
For Russian, things are better: https://freshbsd.org/freebsd/doc?committer[]=Vladlen+Popolit... – see https://cgit.freebsd.org/doc/commit/access?h=refs/internal/a...
That said, for non-core utilities on Linux it's pretty hit-or-miss. The BSDs are generally pretty consistent in what they do offer, and that's what I love about them. Of course it's a different development model and it shows.