[dwyerm]

For me, personally, the way Amazon has captured me is more in the cart than in the fulfillment. Yes, it is nice to get things to my door practically overnight, but the fact that I can make that happen without typing my personal and financial information into a skeevy website that could be anywhere is the real value to me. PayPal (...and Apple Pay and Google Wallet and Samsung Something and Venmo an Beanz and and and...) is the technology that should be making this friction go away, but it appears to be difficult to provide this without turning evil.

So, to your idea, I also appreciate the idea of one, trustworthy, site that would do all of that for me. The thing is, Amazon is that site, for the most part.