[hadsed]

I think a lot of responses to this are missing something unsaid here: a single interview day for someone doesn't always give them a chance to be their best selves. That's ok but you do what you can given this fact. The whole thing is about being risk adverse with who you bring on to the team. This is the right thing to do because bad hires are exceptionally costly. It isn't a judgment on the candidate's innate value as an engineer, it's about a single sample of the "is this person a good fit for our team" function, which is different!