I have 2 in every room.
It's good to have a backup machine that never goes online on each desk, not even for updates because they work well if they never get connected to the web, just used for storage of already security scanned media and pics and stuff.
I don't need the add companies spyware counting how often I look at my personal pics or whatever I want private, anything on a plugged in machine is an open book, we have no real privacy online.
I have tinnitus, 'ringing in my ears' and I recorded some rain sounds and shower sounds of my own, well I go to play my personal recordings now that I have win 10 and there is a dam advertisement attached to my personal stuff, I'm sick of it.
I have a couple old laptops running win 7 that will never go online, even the wifi is disabled and I may physically remove the internal antennas...until they make what we can do with our own pc's illegal, btw deleting your history can be a crime.