Joe F: Cell phones & tablets are small, smooth, & heavy -- easy to drop & damage. They are also easy to steal; something like 1/10 of all cell phones are stolen each year. Nevertheless, nobody puts a hole thru them or attaches a bail so that they can be tethered to the bearer. I recently bought a tablet & epoxied a loop of fabric to it.

Actually, they do. Both my current phones have a small hole punched in the casing where you can loop through a thin but strong cable that came with the phones. The cables are finished with eyelets that allow attachement to something else (they're not very long in themselves).

My last 3 phone have had the same, 2 of them with suitable wires for use as wrist loops included in the boxes.

I've never used them, but they were supplied.