Where is this place you go? Because doctor's offices either have desktop workstations or a lightbox to throw up X-Rays (or will just show you print-outs). With an iPad they can just pinch out to zoom in. YC and Start fund seems to dig the idea of doctor's using iPads, seeing as how Dr Chrono got funded.
"Some of your examples seem contrived, like the office meeting where someone is dragging their power brick"
It's not contrived because I saw that constantly at the office I worked in (before I started working from home).
"Police in their cars don't need a smaller display"
The ones I've seen in cruisers have 10" display bog-standard notebooks (some I believe still use DSTN screens, which are ancient as hell).
"Delivery drivers already have solutions that are designed for their specific application"
Right, as if that gigantic gizmo with 1000 buttons and a tiny monochrome resistive pressure-pen screen UPS drivers carry for signature confirmation is the end-all technology for delivery drivers.