[jaclaz]

If I may, there is a "niche", but most probably economically valid market in professional digital forensics and/or data recovery.

The first (obvious) use is tapping access codes or swiping patterns to unlock a device (when/if the number of attempts is resettable [1]).

The second is to document contents, on some phones (unlocked but for which there is no available imaging/copying solution or for specific apps for which there is no external reader), the current procedure is (say a communication app) to manually have a message on the screen, take a photo of it, swipe to the next one, take another photo, etc.

See as an example/reference: https://www.forensicfocus.com/Forums/viewtopic/t=15977/

[1] Since the reset in many cases is through a power reset, an accessory "push button tool" will be needed.