I suppose they want to be able to threaten countries by sending a flock of nuke-ladened bombers to circle just outside their airspace. That won't work with stealth bombers because they won't show up on radar to be noticed.
I don't believe that any lemons have been handed out here. They had the option of replacing all of the B52s with unmanned stealth bombers. We are keeping the B52s because the people in charge see some kind of advantage in keeping them.