Yeah that is wild. Back on windows I had a three monitor setup at one point and honestly rarely utilized the whole of it.
Ever since moving to Linux and learning about virtual desktops I have never felt the need for more than one monitor. So I could hardly imagine the need for seven beyond novelty lol.
I had 5 monitors for a bit before changing to a 32:9 monitor for my main monitor which gives me the equivalent of 4 monitors.
As long as the monitors are setup right (e.g. leveraging vertical space and not just horizontal space), I find the desktop real estate to be invaluable.
But, I started doing dual monitors over 20 years ago. So, I'm an early evangelist of multi-monitor and have adopted workflows that greatly benefit from it.
I'd like to try it out one day, for now I don't think I want to do that kind of investment in my setup. It sounds glorious though to have so many monitors.