I am planning a basement reno and having hanging power boxes is part of my plan. They are often used in industrial settings and have to be in proper conduit so there is no strain on the wires. The outlet box is not in the ceiling, but hangs down.
I work in a commercial bakery from time to time and we have two outlets hanging above one of the free standing tables.
In planning my reno, I will have two or more hanging outlets and numerous countertop ones.
There is no problem unplugging from the hanging outlets, they are well within my reach. I am 5'5" tall. In my basement, where the ceiling is a bit lower than most, it will not be a problem at all.