"Everyone just has a network, but some only have a single site on them."

Pure gold, we use this often. Has many advantages when the client requirements grow/spread beyond a single site.

Even otherwise WP Multisite is a gem, can be and, is used across so many used cases, perhaps more by those who dared to play with it, but is one rock solid solution for several use cases!

A huge shout out to many who championed the cause and got it pushed into core, things have been pretty sane since.