Sure. I work in a large university building and can power up/down various systems from my desk for the same reason. But it doesn't require a full tablet computer in each room. These are simple network addressable devices on their own VLAN that allow me to (for example) create an interface that sends a string of commands like a remote control, provided I give proper auth. If you're a regular person in any of the rooms in the building, you can't easily gain access to the VLAN, much less connect to any of the networked controllers in the rooms.

As a result, I can shut things down from my office or set up schedules to do the same. I can monitor usage and save resources (lamp hours on projectors and lighting, etc)

The idea of using a full-on tablet computer is just silly and sounds more like something I'd do while tinkering at home and was looking for a use for some old phone or tablet sitting in a drawer. It's not something I'd put in any enterprise or commercial space.