It's a few years ago now when I passed my test but the stress was on "check rear view (interior mirror), signal, check blind spot etc"Does anyone really think that a driver with no functional wing mirror doesn't use any other method to check the situation? If they have a mirror, they might not bother to check properly, but if they don't they pretty much have to. It might be counterintuitive, but it's probably safer - even if that's not why they do it.
Little emphasis on using wing mirrors other than to emphasise that the distances appear different between wing & interior mirrors

