Earlier quoted context omitted.
I'm curious is this because jd.com is far ahead of American Amazon or because Chinese Amazon is far behind American Amazon?
Having lived in both China and US/Canada, I would say jd and taobao is far ahead of American Amazon. Some key differentiators include delivery speed, UI/UX, product offerings and the ability to chat with merchants instantly.
I don't have a ton of experience with UI/UX on JD or TMall, but my experience with alibaba and aliexpress hasn't left me particularly impressed there. But I also have no problem with Amazon's interface and experience in general, which I know lots of people don't like.
Product offerings have never been an issue for me. The overwhelming majority of my online purchases come from Amazon, and the ones that haven't made recently have been pretty niche - handmade Japanese chef knives, limited run board games, manufacturer direct audio equipment...
I can get assembly for furniture, etc., as an add-on for a lot of purchases on amazon, which someone mentioned as a differentiator in another thread.
I can't talk to the merchants instantly, but I don't know that I really want or need to. I rarely have a question for them, and when I have, I generally don't want to get bogged down in a live chat or phone call or whatever, so the email system on Amazon works fine for me.