I was referring to Rebel Transport and Tantive releases before anything was developed for Imperials.
As Vanor pointed out, the Gozanti and Raider didn't exist at the time, but it still didn't mean they had to go ahead with two releases and new X-wing pilots.
That's my opinion at least.
I think that's looking for bias (or however you wish to word it) where there is none. The most likely reason is not some FFG execs twirling their mustaches at the thought of Imperial players crying, but rather the lack of canon Imperial ships in the 300 meter range. And X-wings were largely obsoleted with the release of the B-wing, so an X-wing pack-in with the transport probably seemed like a good idea at the time.
Should they have fixed an Imperial ship back then? Maybe. But I actually think the experience they've gained since then has actually paid off in the more recent expansions; consider that no one actually flies the X-wing pilots in Rebel Transport (really, the only card you see is R3-A2). Compare that to the pack-in TIE Advanced fixes in Raider, which brought back TIE Advanced in a huge way.

