Great tier list; formatted well, follows helpful meta strategies, and it's cohesively written. I do think the Step Stool is rated a bit too high though, even for a pre-Boss accessory. It's ranked C, above items like the Flipper, Water-Walking Boots, Lava Charm and Obsidian Skull (and the Shackle, but since it's just one defense I can understand that), and I wouldn't know if it's necessarily as good as them, let alone better.
The Aglet is also ranked above the Anklet of Wind, despite both of them only affecting movement speed, of which the Anklet of Wind provides 5% more of. Would the explanation for this be that the difficulty or time-consumption of getting the accessories also comes into determining the ranking? There are some mentions of that through the list.