That sounds like amazon is wasting employees time then. That runs counter to my experience with other large tech companies.
I think it is worth it to the company for me to spend the 5 extra minutes of my time (since I'm going to eat lunch anyway) and $25 on lunch to defuse those concerns and sell them on the team. With the phone screen, the interviews, the feedback forms and the debrief, the company is spending a ton of time on each candidate brought on site. Loosing a candidate you make an offer to is the worst waste of time.
And what do you tell them / what do you think?