I wouldn't say that's what Amazon "wants", and often the interviews have little correlation with the actual job.

We all know the interview process (across many companies) is a difficult / broken process. I think it gets even more difficult with scale the size of Google, Amazon, etc. How do you offer a consistent candidate experience and stable hiring bar without severely limiting the number of candidates processed or eating up too much developer time?

I'm sure we could find a dozen threads already discussing this on HN though.