I think the objection to sensor boats comes from the sense that they eliminate the need for the "Exploration" part of this 4X game.
I know it has been mentioned before, on dev streams and the like, but heavenly-bodies (planets, stars, black-holes) and nebulae should block sensors. If there was occlusion then it wouldn't matter if your sensor boat could see across the galaxy because there would be so much stuff in the way. And if you wanted to see what's on the other side of that nebula or black-hole, you would need to physically move your sensor boat to the other side.
This would also open up the possibility for jamming tech that could disrupt or trick sensors.
Of course, this would need to be implemented in the code and I have no idea if Stardock's game engine supports any of it. Calculating occlusion for thousands of ships as they move every turn might be too processor intensive for the game (though it's really not necessary to calculate it for the AI).
I would suggest that this should be implemented as an optional feature, so that people with lower-rated machines don't have to take any performance penalty (and people who like their All Seeing Eye can play that way).