I agree. Like I say, there are some instances where zero crashes is absolutely the right goal. It may not be absolutely mandatory for a window manager (in the way it would be for a self-driving car), but I can understand why someone would want this as a goal for this app.

My point was more that I don't think it's a sensible standard for all software. I hear this kind of thing quite regularly, usually by non-technical managers, often in a way that seems to suggest they think bugs are either the result of pure sloppiness, incompetence or downright malice.