Whereas the functionality subject to many discerning eyes filing bugs about every little thing is probably doing pretty well.
That time at Apple when we were sitting in a meeting, fat and happy about the bug count in a new C compiler and how ready it looked to ship, when it was revealed that a Q/A person had turned the floating point tests off six months earlier "because none of them were passing" and hadn't turned them back on.
We all learned a lot about how floating point worked in the next couple of months.
(Your typically industrial robot does not rely on software for safety. However software can make the robot respond more gracefully.)
They are there to prevent humans from entering.
PS: Warstory seems familiar? Sebastian? Olli?
Only to find out they barely worked. FWIW the unit tests were pretty solid but the integrations weren't and the graceful degradation story was a little too good.
So we went from no complaints to having an entire department breathing down our next because all of the sudden people started giving a shit about our product (web performance improvements).