They’ve had that standby mode for a few years for sure (I mostly use PS, but Xbox will have the same). I don’t know why though, for whatever reason after a while it just stops working. Might be the routers cycling or whatever, but it’ll stay on standby forever, but when you login there’s still a sea of updates and most stuff is unable to be played. I hear you on the multiplayer requirements and whatever too, personally I’m never a multiplayer. I’d accept the risks of a game being out of date if it just allowed me to skip updating.