There's no specific point in any of *BSD. They all are general purpose OSes. NetBSD forked from FreeBSD, OpenBSD forked from NetBSD. Conflicts between developers were main reasons for that.
They evolve differently. Saying *BSD is like 4.4BSD is still developed by ucb to provide a single base for all BSD.
Michael W Lucas wrote in Absolute FreeBSD (3rd):
Absolute BSD (No Starch Press, 2002) was my first technology book and was written when the various BSD operating system had more in common than they wanted to admit. The second edition, Absolute FreeBSD (No Starch Press, 2007), came out after the BSDs had diverged, and detailed FreeBSD's advances in the previous five year