The hard thing about this is that it's not all software. Just look up what can go wrong with "the handy."

The thing is a pinch hazard and a user could get their scrotum sucked into the slit of the machine, or get pinched as it vigorously slides back down.

Just look up the reports of what can go wrong --it's not pretty. ("do not press it on your scrotum" is the frequent community refrain.)

AFAIK, most of these devices do not have pressure sensors and feedback mechanisms. They're output only.

No amount of software develpper empathy will help as when things go wrong it will happily slice your genitals off and keep chugging away.