It's not that common sense gets lost, I think what happens is the lessons keep getting forgotten as the new generation enter the fold, and reinvent old concepts

It's not that common sense gets lost, I think what happens is the lessons keep getting forgotten as the new generation enter the fold, and reinvent old concepts ("everything old is new again"). As an industry we don't do a great job of persisting lessons learned. Not sure how we could, I've got no answers, just an observation of what happens.