There is so much that doesn't work, as others have said. Things that have been raised repeatedly over many years, which still don't work. We don't even bother reporting issues any more, just move products to other channels.
1) Customer services do not/cannot resolve simple listing issues. It's not uncommon to have a thread with 10-20 messages in, where another platform would resolve in a single contact.
2) Products constantly removed from sale for X reason, Y reason, by mistake, suppressed etc etc. Other channels don't do this so you have to spend zero time fixing listing issues, trying to get listings reinstated.
3) Product listings impossible to correct if there are errors in them. Revising a listing on other channels takes less than a minute. On Amazon this can take (and I'm not exaggerating) days or weeks, or usually go unresolved.
4) Wrong images in listings which are impossible to fix
5) Showing customers 'size guides' which are generic and have nothing to do with the actual product
6) EANs assigned to incorrect products and impossible to change, so you can't list a product to begin with.
7) Sizes listed incorrectly (e.g. barcode for a UK size 10 is listed on Amazon as a size 8) - impossible to fix, therefore impossible to sell. We have thousands of products that we can't even list on Amazon one reason or another. 100% of items are listed on other channels.
8) I am amazed that Amazon still rely on spreadsheets and CSV files so heavily to list. This is a block for lots of people who are not tech savvy. It can take ages to troubleshoot a file issue sometimes to list an item.
9) Difficult to assign child items to parent listings and/or change the child items in a listing (e.g. if you get a new colour of the same product)
10) 'Contact Seller Support— Request corrections to product detail pages when standard edits aren't working' - this is hilarious. 95% of issues we report to Seller Support are never resolved (they might mark them as resolved, but what actually happens is that they either just do this or we give up with the issue after 10-20 contacts going round in circles and getting auto-replies). In our experience it's pointless contacting Seller Support. We just give up and sell the items through a different channel, where listing is simple and quick.
11) Mis-matching information. We have products that we add to listings where the product title says Medium and the dropdown says Large for example. Then you get returns from customers saying things like "I've ordered this item 3 times from 3 different sellers and you've all sent the wrong size"
12) Telling us that listings can't be changed without the brand owners permission when the brand is not a retailer and has never sold (and will never sell) on Amazon. The brand have no relationship with Amazon. Listings are just dead at this point.
13) Licensed products. Good luck with this one! You try listing Disney, Marvel, Liverpool FC, Paw Patrol etc on Amazon. I totally understand that you need to protect buyers and brands and have proof of our supply chain. We send endless letters, contracts etc and they are just repeatedly rejected. Barcodes are assigned to the licensed manufacturers, manufacturers provide all letters/agreements. Manufacturers of licensed products that we have had relationships with for 10-20 years. No issue listing on any other platform. Given up trying to list on Amazon. All the fees for these products go to other marketplaces. Absolutely pointless exercise trying to sell on Amazon (unless you want to have a mental breakdown). Generally a retailer has no direct relationship with the brand owner. Here's how licensing works,
BRAND OWNER (LICENSOR) (e.g. Disney) signs a licensing agreement with a MANUFACTURER/SUPPLIER (LICENSEE), who supply licensed products to a RETAILER, who sell products to a CONSUMER/CUSTOMER. The retailer has a relationship with the licensed manufacturer, who make the products. Asking a retailer to get authorisation direct from Disney is just not going to happen (it's like saying you can only film a school play if you get full permission from Steven Spielberg or Christopher Nolan!)
There isn't a 'Disney factory' who make every Disney product!
Amazon need to protect authenticity by contacting Disney and asking them to provide a list of authorised licensed manufacturers. If a retailer can then prove products have been supplied by one of these authorised licensed manufacturers, with invoices/letters etc, problem solved.
Most of these issues have existed for years. Just a few that I can think of off the top of my head!