If a machine is going to have multiple users (all my computers have multiple profiles for family members) all those users have to be called something, and I’ve not got the energy or the creativity to come up with fun and funky usernames for every system when my actual name is more than good enough.
It’s a command that pulls a whole bunch of useful system information and sticks it on one page.
Really, the biggest use of it is for showing other people your system- especially showing off. It’s a staple of “look at my system” brag posts.
But to be generous, there are (small) legit use cases for it. If you manage a lot of machines, and you plausibly don’t know the basic system information for whatever you happen to be working on in this instant, it’s a program that will give you most of what you could want to know in a single command. Yes, 100% of the information could be retrieved just as easily using other standard commands, but having it in a single short command, outputting to a single overview page, formatted to be easily readable at a glance, is no bad thing.