These are the major issues that are happening from my experiences and have been costing both Amazon and sellers a lot of time and money:

• Unclear and conflicting policies for compliance. We are left appealing again and again until someone looks at it as each listing gets flagged because Amazon's CATALOG NAME for the product ID is a prohibited term. It has stopped us pursuing new listings since we have to do this every time, which is exhausting. No one seems to want to fix that Amazon should not be giving a product ID name a prohibited product name and not the same product, nor give any clear instruction on how to fix our products from consistently being flagged from this issue. I was told "these are permitted, but we cannot tell you what you need to meet compliance" - how is that transparent?
• Abusive buyers we can't do anything about. As an FBA seller, I am instructed to use the "report abuse" button - but when a buyer switches out products and returns cheap plastic knock-offs of our handmade wood ones I have the only choice of "report abuse not listed here" and then it is immediately rejected as no abuse is found. I am unable to submit any information to be reviewed, including an entire spreadsheet costing Amazon and us thousands upon thousands of dollars. I eventually get help on the forums from mods and then he simply opens a new account. This has been his cycle for a year now and I STILL cannot "report abuse" on a buyer stealing products. (I even found his eBay account where he resells stollen Amazon products)
• Give brand registry control over their branded listings. This would also eliminate 90% of listing hijacking. I have errors on listings I am updating. Come to find out, Amazon was pulling data from other listings/sellers that are not authorized or even in our marketplace. We are brand registered owners and manufacturers of an international company, yet we cannot get brand registry to stop allowing other sellers to make changes to our listings. They have no permissions to do this, yet we are denied any control over our brand representation. Other companies do not care if they are not following Amazon's policies and our hands are tied on fixing it since they are now the main contributor...how does THAT make sense? We need to start giving brand registry the control we were promised and stop allowing random sellers to make changes on ALL branded listings, just like they did with Generic.
• Account Health damages accounts more than helps them. Their department needs the same tools catalog does to check for compliance issues. They have consistently given bad information and actually damaged accounts. Account Health told me when they couldn't figure out the issue to admit fault, delete, and relist it. That is a way to get your account shut down! I know better than that but how many sellers don't? Account Health doesn't know Amazon policies? They just guess at what might be the issue and usually send you to seller support because they have absolutely no rights, control, or ability to look at or do anything. They need the ability to give educated answers, not guesses and dangerous resolutions that can permanently damage accounts.