You disagree based on...speculation? The Imagineers know the attraction and the land and know the best way to present it.
Having the Falcon outside in a bay for passerby's is a great weenie for guests. It is iconic and such a feature will be a crowd favorite and a necessity to the land. If this same Falcon was used to board the attraction, we'd see a queue leading up and into it. Why would people be lining up to get into an old space jalopy? How could so many be lead into this craft that clearly can't fit more than a dozen people comfortably? Are people also exiting the same ramp? That will certainly create a crowd flow issue if the way into the attraction is the way out as well.
Since you are obviously working with a limited knowledge of the attraction, as we all are, its a little silly to claim that you know what works best for this experience.