Yeah, that's exactly what I was complaining about. The "shipped and sold by amazon.com" experience is super luxury. For consumer goods, and a whole lot of industrial parts? I have next-day access to a giant warehouse of stuff. I'd pay a lot extra for that. They cheapen that by adding in the shitty aggregator capabilities. (though, like I said, the biggest problem is mixing reviews, and making it hard to limit your search to just 'shipped and sold by amazon' - when looking at a listing, an experienced user can easily see if it's amazon or a shady third party)
A lot of my friends have big storage units full of stuff for projects, books they found that they want to read at some point, etc, etc... things we have bought before we needed them because we didn't know that those things would be available when we needed them.
As amazon gets better, there are more and more classes of things I don't need to own until the day before I need them. For those of us who live in areas where storage or living space costs way more than "stuff" - this is huge.
Think about a world where we don't have to go shopping. Especially where we don't have to go exploratory shopping, where you don't have to buy the things you will need ahead of time.
(actually, I mean, this is a very silicon valley perspective; I visit family members elsewhere in the USA, and it is so weird to me that one day shipping isn't available if I forgot to pack a thing I needed. At that point, it becomes a lot less luxury.)