[OJFord]

Well that could be even more interesting! Not likely though?

[oatmealsnap]

I use my old MacBook Air as a server. Really easy to set up out of the box.

[OJFord]

I assumed (perhaps incorrectly) that they meant non-macOS Apple hardware servers.

Also this was never intended for people using an old laptop 'as a server' anyway, of course that works, and people doing that don't need the enterprise features from a server-specific version of the OS.