Lois, you are also overlooking the fact that sometimes there is no blue sky! Here in Tokyo, the sky is white/gray most of the year. No amount of exposure fiddling will get you a blue sky!
You've got a very amusing understanding of exposure.By exposing for the subject properly, you WILL end up with a lot of
blown skies. That's the nature of exposure.
Very convincing - LOL!Before:
After: