Light is another noise, one effecting Earth-bound observatories. Not so in space, with proper shading, as I believe all are. Another Solar noise is radiation. All I was saying is it's a cleaner environment on the dark side of the Earth, within Earth's magnetotail, where more can be learned, and more can be done, such as making wider scans of the spacescape, if the craft is designed for this.

With the Moon's rotation, there may also be periods of total radio blackout with the vessel, much as we observed when the Apollo craft orbited the Moon. This, too, should pose no problem.

I brought up Lagrange Point 2 because which Lagrange was not mentioned in your post, nothing more.