Ryan McAvoy said:

Would have been a cool PT idea if Alderaan was once the planet where the Republic Royal Family lived (Princess Leia being the latest in the line). For generation's they ruled in Peace as nominal heads of state with the Republic Senate alongside. Kinda like ancient Rome.

As much as I dislike the PT, this is the one time that Lucas got it right by not using Alderaan as a main planet. Sadly, he got it wrong by making Anakin from Tatooine.

Luke and Leia were supposed to be hidden from the Emperor and Vader, and the fact that they put Luke on the SAME planet his father was born is pretty stupid if you asked me. By not having Alderaan as a main planet in the PT, it atleast jives with them hiding Leia as Vader or The Emperor have no ties there and would be harder to sense her.