Not sure what Amazon could do about the products being trash though? If you feel unsure about it, why don't you go inspect the item in some store in person, instead of guessing and buying it by delivery?

Historically retailers have employed buyers in charge of selecting products that would appeal to the store’s customers. A customer will likely have different expectations, and have an existing understanding of what sort of products they’ll find if they’re shopping at, say, Nordstrom vs Dollar Tree vs a guy on Canal Street in NYC.

Amazon sort of threw this out with the steady movement towards blending third party sellers in with products they sell directly. They made it less and less obvious and easy to filter based on seller over time, so now you have all sorts of junk from the digital equivalent of street vendors mixed with normal products, and it’s up to the shopper to figure it out. They tolerate tricks and fraudulent behavior from those sellers much more than they should.

Amazon could, if they wanted, make it easy to filter for products that have been selected by a buyer who has a relationship with the vendor, and are directly sold by Amazon themselves, but it’s seemingly more profitable to allow third parties to peddle garbage en masse.

Not the person you're replying to, but for me, everything I buy on Amazon is bought because I have no B&M retailers that sell it. Even my local B&M stores usually have vastly reduced stock compared to what they have online (looking at you, Old Navy, Eddie Bauer and similar, who only carry petite sizes online).

That’s essentially their conclusion, right?

Amazon could manage QC; other large stores do. (Admittedly not as large as Amazon.)

The quality/price/speed you see at Amazon & Aliexpress are market segment choices.

No physical store sells most of what’s on Amazon. That doesn’t imply it’s bad either.