The issue soon became clear: The app had been accidentally designed for right-handed users. When a minority of users rotated their phones 180º to hold in their left hand, the resulting video was the wrong way up.
Diversity comes in so many different forms, and YouTube's anecdote is a powerful reminder that having a wide range of people on your team is critical to ensuring your work is accessible by all.
We are blind to what we don't know. So to best serve those we seek to help, we must lean into expanding our awareness of how others interact with our work and the world.