alt Hacker NewsI haven't seen it, but my opinion is she likely was what lawyers call "reckless", as in she should have known but didn't care (blinded by the upside and a "we'll figure it once we scale" tech attitude that works a lot better for db performance than healthcare).
I've worked for someone very like her.
It's worse than reckless. They make not-knowing part of their operating model.
And they make sure nobody else with power and influence does too much knowing either. Silos, stay in your lane, don't ask questions about how your department's KPIs mesh with the next one over, or what conclusions might be inferred.