This is what always happens, because it's not the same people/teams/companies filling the bags and building the conveyor belts, and because it's easier that way

This is what always happens, because it's not the same people/teams/companies filling the bags and building the conveyor belts, and because it's easier that way. Another reason is that people are reluctant to give away any sort of convenience or vanity (a few nicer pixels in their website design) just for saving someone else's resources (bandwith/data/latency of server & and user). For the same reason people are driving SUVs in cities - it's a horrible misfit, but makes them feel good about very marginal benefits.