anyone else notice that most of the posters are junior members?
Also, as it's been said, a 7 item build would completely unbalance things. By being limited to 6, not only does it cap your late game build, it stops you from half building a million things early. I know that as Udyr, I never carry around all three of the items for my Aegis, because my inventory is occupied already. This stops me from having to choose between armor, or health, or MR. It makes you itemize more intelligently.