True expertise comes from going all the way

It's not that you have to do everything yourself, it's that the person who you trust in the execution role, they have to become the expert. They have to be like, they can't stop until they hit the end.

When Mark has determined that the thing that you're working on is the most important thing, there is no detail too small for him to notice. He will be in a review, and in the same review. We'll be like, 'Strategically, I think we're off course. And also, this one pixel is definitely wrong.'

I think the core problem with estimation is you're asked to estimate things before what the thing is, and it's just a strange output to be expected to produce.