AOSP is not a product and is not really usable by itself. It needs to be combined with Gapps and Google play services to really be considered a product. And I would argue that combination isn't a consumer facing product either. It's a product aimed at OEMs who combine it with their hardware and a few layers of additional hardware integration in order to create a consumer facing product. I know there are open source alternatives that replace many of these proprietary layers but they aren't very popular with the market.