What about precision? do you think that the touchpad is more precise than a good mouse on a good mousepad? I'm not asking you if YOU are more "productive" using a touchpad, I'm asking you if you think that if we compare a proficient regular mouse user vs a proficient Mac touchpad user we'll notice a significant difference that'll make us think that Mac touchpads are the way to go?
I don't think so. I think the factor that weighs more is user preference, heavily influenced by marketing.