I'm going through job interviews now (not with Amazon, but others). The whole thing feels like well-rehearsed regurgitation. Well, and a smidge of acting, obviously, because you don't want it to come off as well-rehearsed. But they know exactly what they want to hear and you're competing with other candidates who see the same writing on the wall and are doing their own rehearsals.
I thought it was just the leetcode, but it's the behavioral questions and system design exercises, too.
Eh, I'm coming across as cynical. I'll be fine--I just wish we (as an industry) had a better system.