Buzz Aldrin would have killed the Apollo 11 crew if Margaret Hamilton had been a worse developer. He pulled up an optional display during the landing that was overloading the computer due to a bug, and the scheduler kept killing optional tasks to keep the control and guidance systems all running.

There’s the same sort of realtime system in the BEAM. When you run nice to have and mission critical software together life is much less exciting if you have something handling such things.