Disclaimer: I work for Fitbit, but don't speak for Fitbit.

Thank you for bringing attention to this very important point. From the tweet:

"FWIW this feature was led by women (product manager, head of product, engineering manager). I am not defending the design & I understand that it fails to meet your expectations. Fitbit isn't that big and the people there care a lot about helping people."

A later reply by a current employee: "Also, the algorithm development was led by a woman."

This is just another software flaw, not a demonstration of rampant sexism. I'd ask commenters here (in general, not replying to the parent comment) to curb their outrage. And if things like this really bother you, apply to one of our many open positions.