There are several reasons there isn't ships in DOTF hangar.
1) Performance. Performance in DOTF hangar has always been a problem with the numerous areas that join with it (Fed, Main, Gen) and adding ships would simply make it worse.
2) Specific classes, mainly Jedi, Sith, and Mandalorian, would hugely benefit from those ships being campable and hard to access or shoot onto by other classes. Prolonging rounds, or giving those classes many more points of ambush giving those classes far more mobility in the hangar than they currently have.
3) It would take a bit more work to do properly as the current models for the N-1 Starfighter in JKA are crap and new ones would need to be made.
4) If added for the sake of completeness, the fly-out script I started for round start would need to be finished.