Simple, if we were smart enough we wouldn’t read the pop version. It’s all there in the name. It’s for commoners and regulars. Not for intellectual royalty.
Unfortunately, this attitude actually makes it harder for us to really try and understand what we happen to be reading. I mean, if I an reading a dumbed down history of the universe, anything I really learn from it would still be basic. And anything I can’t understand is probably beyond me anyway. So I’d better warn people upfront before they mistake me for an expert.