The problem with Sensors is that it is no help in a fight. At best, it is a QoL skill like Navigation, but not as great.
Sensors 1 is almost mandatory for Neutrino Detector. Rarely, there will be that <1% fiendishly hidden pirate base that will be too hard to find any other way. (Spending thirty minutes in a huge system trying to find a base and failing despite exploiting every other trick that quickly finds most other bases is unacceptable, I do not have that kind of time to waste on frustration.) I really dislike being forced to put a point here just to find that rare base that is too hard to find. I also dislike hauling more junk cargo (volatiles) to use the detector.
Sensors 2 is fun for a pure phase fleet. Great for stealing blueprints from Culann and Sindria.
Sensors is good before endgame when player is not a god of war. Once he is a god, Sensors is useless (aside from Neutrino Detector) because player can just kill everything. It is much like colony skills, great before player can farm cores. But once he can grind for cores, he will bitterly weep at the end for wasted skill points.