While it is amazing for initial discovery to have everything presented for the developer's inspection, in production it ends up requiring too many network round-trips to actually traverse from root to /resource_name/resource_id/sub_resource_name/sub_resource_id, or an already verbose transaction (everything is serialized and deserialized into strings!) becomes gigantic if you if don't make it hierarchical and just drop every URL into the root response.

This is why everyone just builds magic URL endpoints, and hopefully also includes a OpenAPI/Swagger documentation for them so the developer can figure it out. And then keeps the documentation up-to-date as they add new sub_resource endpoints!