The Plough is much simpler to handle imo, because you're only directly dealing with one roundabout at a time, the "meta-roundabout" is more incidental rather than the mess of Swindon.
Not quite strictly true. You can traverse the inner roundabout without having go full circle around each of the satellites.
True but these functionally behave like "roundabout bypasses": if you want to take a right at the roundabout, for the biggest and most engorged roundabouts around here it's common to have a lane letting you turn without entering the roundabout.