The soap dispenser that doesn't recognize dark skin:

https://gizmodo.com/why-cant-this-soap-dispenser-identify-da...

Facial recognition systems that don't work well on dark-skinned people:

https://www.wired.com/story/best-algorithms-struggle-recogni...

I can't find it now but there's another demo of the simple face detection algorithm (not recognition, just highlighting that "here is a face") simply not detecting a dark-skinned person til she lifts up a white mask to her face, and then it detects a "face" immediately.

Something as simple as soap dispenser not detecting dark skin, would that have made it out into production if they'd had a dark-skinned person on the team? Something as basic as, "Hey this doesn't work on Jim, maybe we should tweak the sensor a bit."

That's where some diversity matters, just so that your products work on everyone out there.