There’s a trend of doing impressive things by pushing many of the hard problems into S3 and assuming S3 “just works”, then not bothering to explain how S3 works. I guess we do the same thing all the time with other miraculous solutions to hard problems, like assuming that superscalar out-of-order processors “just work”, but in cases like this it makes for an unsatisfying explanation. Especially because S3 is a proprietary product, not an algorithm.