What is the advantage of stealth on an observational satellite? Are the Russians really moving equipment out of sight every [orbital period here]? Or locating

What is the advantage of stealth on an observational satellite? Are the Russians really moving equipment out of sight every [orbital period here]? Or locating equipment out of the observational path? Elsewhere in the comments, there is speculation of trying to hide an orbital refueling capability. This also seems like an obvious capability to already have, given the automated docking procedures used on the ISS for many years now.