> everything that doesn't require a physical presence (factory, warehouse jobs and so forth)

I don't know what kind of fairy tale world you're from, but you need actual human on site to fix and mend broken machines AND broken operation processes, and also need managers to manage those men.

Also, employees are stakeholders, too, and it's often important to gather various information to gain insights into the operations of the company, so that they can speak up before it's too late. Being able to observe actual processes also helps managers to more precisely understand and analyze operations. (Not that these work as intended in real world, tho.)