Imps can't get to Anchorhead anymore? That sucks, one of my most memorable experiences as a new player was seeing a bunch of imperials in an Anchorhead cantina roleplaying, and then eventually breaking out in to a fight.
Why remove fun things?
Nothin' stoppin' you from doing it in Alderaan.
It just wasn't intended to occur in Anchorhead/Mos Ila, that's all.