Yeah, but dont you understand no one that is a casual bitcoin user is going to be a node? nodes should be people that can run a computer 24/7 and have power of computing and so on and so fort, not the average bitcoin user.
dumb people have terrabit harddrive with a million of futiles files ... (PPS, JPG)
dumb people have a internet connexion without known the speed (specially upload that it can be high !) ...
what the problem to run and open the bitcoin-core client ?
it need nothing after download the (long and) enterly blockchain ... on normal computer.