As a Roblox developer, it is currently too hard to locate accessories that have been inserted to a character through HumanoidDescription. Any game that is modifying avatars has to have an idea of what accessories are being equipped to the character. Currently, the only way to track this is by inserting accessories through InsertService instead. With the increasing complexity of layered clothing and accessories, this method will have to be replaced with HumanoidDescription.
If Roblox is able to address this issue, it would improve my development experience because I rely on being able to modify accessories that have been inserted to characters. My suggestion is to assign a AssetId property of Accessory instance, set by InsertService and HumanoidDescription when inserting items from the Roblox catalog.