Yes, operating systems other than OpenSUSE have this feature. TrueOS (formerly PC-BSD) has had it for some years, too.

* https://blog.pcbsd.org/2012/07/9-1-feature-multiple-boot-env...

* https://blog.pcbsd.org/2013/06/pc-bsd-status-update/

* https://www.ixsystems.com/blog/a-closer-look-at-the-changes-...

* https://www.ixsystems.com/blog/the-revamped-life-preserver/

Sadly, I got out of the Solaris game a couple of years before ZFS became a thing. I'm using ZFS on FreeBSD though, I quite like it.

Yes, FreeBSD adopted the same command Solaris has for boot environment management -- see the beadm man page.