There are a lot of occupations where you don't have your own computer, and share one with many other people.
For many jobs, the value is not in the person, but in the position, so the position has a single computer for a function that multiple people fill. Especially if you work for a company that operates 24/7.
For example, each person person operating a control computer at a recycling station does not have his own computer. There is a computer for each position, and who mans that position will change from day to day.
Freight dispatchers, retail sales, customer service, airline operations, and many broadcast positions are in the same boat.
Imagine how big an airline ticketing counter would have to be if "In this day and age, you should not login to anything from someone else's PC" was reality.