Funny thing is, they did try to fix the T-65: That's what the Integrated Astromech was meant to be. Alas, they were off by a point - had it discounted the astromech by 1pt in addition to its usual benefits, you'd be seeing T-65s all over the place where someone wanted a solid bit of gunnery as filler.
You really think that 1pt would make a serious difference to generic X-wings? By that reasoning, the X-wing is overcosted by <5% (against whatever we consider the baseline to be). I would argue that in a game with this level of granularity, <5% is so small as to be unnoticeable.