The simulation of the status quo makes the assumption that aisle seat passengers wait until the row ahead of them is clear before collecting their luggage, nobody ever manages to squeeze past someone collecting their luggage, nobody in a middle or window seat is ever able to retrieve or be given their luggage until the aisle opposite them is completely clear, nobody ever walks past someone in an aisle or middle seat that hasn't collected their luggage yet etc...

Suffice to say, this is not my experience of boarding and leaving aircraft.