I also got a bad impression from that, but upon further reflection, it's a more interesting choice. Keeping the plug port in the trunk means that the charging cable (kept in the trunk) can stay semi-permanently plugged into the car, which is perhaps nice when you're charging away from home. The question I have is, because the cable goes through a cut-out in the trunk to reach the charger, how well that holds up to rain, attempts to break into the trunk, etc.