I've stopped buying much at all off amazon because I get it all from Aliexpress. They package up and address individual items in shenzhen/guanzhou, stick them

I've stopped buying much at all off amazon because I get it all from Aliexpress. They package up and address individual items in shenzhen/guanzhou, stick them all in big containers, then when they reach the US/europe they deliver them by the cheapest means possible in a totally commoditised fashion. What competitive advantage does amazon.com have now? Why do all those small sellers need to exist? everything they sell is made in china anyway.