O
Octopus
As Strima has already outlined. Yes, in the perfect world where everyone practices safe isolation and assumes nothing, then it should not ever happen that a person touches anything that is live. But, seriously, have you never touched a neutral without putting your tester on it? Never?? And of course, there is the risk to those who do not practice such things, it might not be right, but it happens, and under those circumstances it is very dangerous. You can't live in a perfect world, because the world is not, perfect. I don't believe any spark that say's he has never ever touched a neutral without testing it.
Please read my reply again .....................more carefully.