Please. People are overstating what the Rebel Aces packs are doing. The A-wing NEEDED the change. Their primary role was to be the filler of the Rebels. Which was replaced by the Z-95. With the Chardaan Refit, the choice between a filler Z-95 and A-wing is a bit more of an actual choice. Without it, the Z-95 was your filler, leaving the A-wing in the same zone as the TIE Advanced. And the Prototype Pilot title allows you to experiment with new roles for the A-wing. I mean, I actually want to use Tycho AND Daredevil now. And the crew choice for B-wings is being a bit overstated. Most of the time, a Rebel player is going to stick to Sensors as their upgrade of choice. It does give some interesting choices for the unique B-wings, which I'm happy with, since they aren't the most popular ships to use. Jake and Farlander are both good. No one is going to deny that. But they are no where near the game altering pilots people are panicking about.
As for the actual game balance, while Rebels may have more "options", the game is still greatly balanced among the sides. Especially after Wave 4. Sure, turrets will be annoying for Phantoms. But, the turret ships will hate seeing Rexlar.