On top of what everyone else said, if you're scanning something like a book, holding it upside-down on a scanner bed and pressing it flat will give you a much better scan than holding it open with your hand right-side up so you can get a phone photo of it.
People with essential tremor perhaps? There is ZERO point me trying to scan something with a handheld scanner because it's a blurred mess every time. Flatbed all the way. Or perhaps a tripod mount for the handheld scanner.