It's long been variable between UNIX versions and variants, for example Solaris 5.x (which is a descendent of AT&T UNIX shown in this video), the common location was/is /export/home, since home directories were commonly exported via NFS to other machines. It might have been IRIX from memory that even used /usr/people.

VFS was introduced around SVR4 as part of the SVR3/SunOS merge IIRC so that made it easier to mount home at whatever location most suited, but the reality already was that home was wherever your /etc/passwd entry said it was. Most Linux distributors had de facto standardised on /home long before the Linux FHS.

Looking at more recent BSD's, FreeBSD 11 seems to be using /usr/home, with both OpenBSD 6.x and NetBSD 8.x using /home by default.