I agree with everything you say, i feel the pain and im sure everyone else feels the same pain.
Im currently battling with a case in which another seller changed an item from item A, to item A + B, so all of my products for that ASIN in FBA are now useless, seller support suggested me to report the listing, which i did, then amazon removed the listing and slapped me with a ‘‘product policy violation’’. I cant change the listing because amazon needs proof of item details that even the brand dosent share on their website. The only person that can change it is the one who created it ???
Only problem is, unfortuantly when you choose to leave amazon, someone will step back in to take your place. If you stopped selling an item, id be able to jack my prices up and make more profit. Thats the sad truth, i dont see any real change coming from amazon, were endlessly stuck on a sinking ship.