Of course, there are exceptions. More than once, I've had to terminate a job or run a belt one handed. If nothing else, it'll get you in good shape.
I have the small Porter Cable sander designed for single hand use now. It is about the best tool I ever used for scribing to the line on a counter back. It made it so easy to sand to the line and move on.
From all this comes the another hazard. A more stealthy one - dust.
The reason I have what you want is, I never lent it out before.
Scraps are a myth.