I still fab hack a lot, just not for Turret Controllers anymore. They used to be the end-all-be-all for the first hack or two, but now I like to concentrate on getting good Core fleetships to support my main battle fleet. Core Starships just cost too much and take too long to build for the help they provide (Protectors excluded) for someone with a "moveable = disposable" playstyle like mine.
But yeah, I actually do perform knowledge hacks these days, where I almost never would before. The turret unlocks are just so useful... but not as useful as getting a cap or two of good Mk V fleetships.