There is absolutely no economic or technical reason to put those sensors on the Moon
but then, I do this for a living so what the hell do I know?
I fully agree that optical sensors can and should be in space performing an asteroid search mission. They would be better served at one of the LaGrange points such as L1 rather than on the moon due to obscura problems. There's no need for radars on the moon because radars are unsuitable for the search mission. The best use of radars would be to refine the ephemeris of objects detected by optical sensors. That can and is being done quite effectively from the Earth's surface.