Hiring the wrong person in corporate roles is very, very, very expensive. New hires are expected to be unproductive right out the gate, and it's hard to measure productivity in general, so you can easily end up in scenarios where it takes months to notice there's an issue and a year or more before you can get the person back out the door. So you really do have to double and triple check that a prospective hire is the right choice.

It can move faster than months, of course, when everyone's willing to prioritize it. But as anyone who's worked in hiring can tell you, the set of people who want hiring to move faster is much larger than the set of people who are willing to accept inconvenient interviews and fill out their feedback promptly.