It hasn't gone away.

* https://freshports.org/sysutils/most/

* https://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/misc/most/i...

* https://packages.debian.org/sid/most

One can even get pg still, with Ilumos-based systems; even though that was actually taken out of the SUS years ago. This goes to show that what's standard is not the same as what exists, of course.

* https://illumos.org/man/1/pg

* https://pubs.opengroup.org/onlinepubs/9699919799.2008edition...