When users never use the features they asked for
I wrote an article some time ago on this exact mistake that product teams do. I called it the baby bias:
<a href="https://www.linkedin.com/pulse/baby-bias-how-start-product-discovery-gon%C3%A7alo-veiga" rel="nofollow">https://www.linkedin.com/pulse/baby-bias-how-start-product-d...</a>