Most of their UI changes have been user hostile or added dark patterns. For instance where once you got local items and sellers by default, now it defaults to international and you have to change a setting to exclude overseas sellers. Almost everyone will want to shop nationally first. It's the same arrogant "knowing better" seen in Facebook's show recent posts constantly resetting.
Picking out one feature that they haven't ruined is poor consolation. As the other commenter notes Amazon has let you break down into price tiers for years. Most sites I shop at can do this.
eBay search results are better than Amazon however - but that is because Amazon's has become so awful.
