AliExpress is a marketplace - sellers are allowed to list what they want for whatever price they want. Which is fair and makes sense in a capitalist system.
The main issue is the terrible search. Sometimes it doesn’t find what you are looking for, sometimes it only shows expensive items instead of properly priced identical ones, sometimes it shows items from 100 different shops but not from the official manufacturer storefront…
The concept of the page as a whole is good, if only their search was less crap, it would be great.
It should ideally show official company shops first, followed by shops with lowest prices, followed by shops with outstandingly positive ratings. It does neither of that.