Same for unit tests and any other practical matters that have turned into religion.
Plus there's the little matter that you tend to think that your application is tested if it has automated tests. Then your colleague in sales who clicks like he's having an epileptic episode comes over and your app crashes 3 different times [1].
[1] True story. I used to ask him to click 2 min on whatever I was working on when he passed by my desk.
[2] PalmOS had the gremlins tool. To my knowledge no other platform has it.