Walking pad with desk attachment

Have seen a few, albeit not many, walking pads with a built on desk surface or attachment. My first thought was.. duh, why isn’t this the norm vs buying a separate standing desk? Then got to wondering if there are stability concerns (will the computer shake as you’re walking?). Or height concerns if the pad handle height is not adjustable? Asking because I’m debating buying a used pad/desk vs a new height adjustable all-in-one. TIA!