I think in a modern setting "common sense" refers to easily to understand lessons and concepts, but they still need to be taught. For me, it's common sense to perform proprioceptive rehab on a sprained ankle to restore function after immobilisation, but that's hardly common sense for everyone.

Why do so many people misconstrue "common sense" for "stuff that feels right or obvious to me personally"

Haha ain't that the truth!