I like to think of it as that conventional cellular is using a broadcast medium for "narrowcast" communications. If you put it that way it's obvious that we're

I like to think of it as that conventional cellular is using a broadcast medium for "narrowcast" communications. If you put it that way it's obvious that we're currently Doing It Wrong, provided there's a practical alternative. It also helps people get over their reflexive "But Shannon says…" reaction.