The Air Force knew that but cancelled them anyway.
You cant really blame them.
The Flying Wing was speced as a nuclear bomber.
It was a difficult plane to fly and an unstable platform from which to drop a bomb accurately. There were a couple crashes during testing and who wants to crash a plane with a couple nuclear weapon on board.
Of course then there were the rumors of Boeing offering cushy retirement jobs to the generals in charge of selecting the next intercontinental bomber.
I saw an interview with the test pilot who flew the flying wing over the capital in Washington D.C.
He had a Spanish name, maybe Cardenas. Anyway he was also the pilot who flew the B-29 which launched the Bell X-1 with Yeager piloting it the time the sound barrier was boken.
If I remember right he said the flying wing was very difficult to fly and to be no means stall it as you would never regain control. The plane did crash but I don’t remember why.