Why is everyone focusing on what this does for the X-wing and not looking at what this does for the E-wing? I have found Etahn to be very helpful and now pairing TA to stay on target makes the red that much less painful. But I know competitive didn't like the E-wing out side of Corran...
Because the E-wing already has access to Fire Control System which grants free target locks, is much more reliable and also 2 points.
Obviously, if you want to free up the system slot for advanced sensors, you eat up the Astromech slot.