Be’s TCP stack was never very good. It never had big money applications like Frame or Illustrator, and lacked the robust dev platform (and paying customers) that Next had.
And I'm using "business" in a generic sense. This was an important quality for schools, as well, where Macs were incredibly popular (for a number of reasons, including favorable pricing from Apple and historical support for schools since the 80s). Single user OSes just don't fit within any organization trying to at least pretend to have decent IT.
How has OS X's "multi-userness" helped organizations?
Do you literally mean two or more people using the same Mac?
Has it been useful for organizations that users can ssh into Macs? Or is Apple Remote Desktop involved? (Does Apple Remote Desktop even allow 2 people two use two instance of OS X's GUI at the same time?)
Or by "multi-user" do you refer to the services that can be enabled using the "Sharing" pane of System Preferences (e.g., file sharing, printer sharing, remote management, internet sharing)?
It’s not about simultaneous use, but standard user management, access control, and permissions.
Though yes, technically this also allows multiple to access it simultaneously via ssh and other things that’s not the important part for IT in this instance.