Nothing is "needed", I'm just stating what is better. Blossom is better because it's more efficient, it will work every time and not hit any barriers, it is much simpler to implement from the publisher side and from the reader side, it's also nicer to use other people's infrastructures the way they were designed to be used. If we want this Napp model to become a standard (and we need that if we are to solve the problems I'm pointing) then these are all very valuable properties.