"They are not a hardly maneuvrable brick of a Fighter"
This is not reality. Boost and barrel roll are defining characteristics of interceptors or the gyroscopic slipperiness of the bwing. Those attributes don't need to be on EVERY ship to make them viable.
Holy cow people, the amount of hyperbole in the idea that the Xwing is in need of some kind of fix with the variety of viable pilots and upgrades available is flabbergasting to be completely honest.