Well the average of that is still 4 and not 6 :P so why is the party size a complaint again?
Because what's standard or average for P&P is essentially irrelevant. A party-based CRPG goes on a fairly different pace than a tabletop session. And deciding what everyone is going to be with four friends OR making up a party from a limited selection of premade NPCs are two very different scenarios.
Anyway, that's precisely why we often point at previous discussions about a given topic: so we don't have to repeat the same exact arguments over and over again.