The whole problem with it is it's kind of elitist bullshit. And probably has to do with seeing.
It's also elitist in that it refers to photography of objects and not people. Because expression is fleeting. In fact very few can even draw expression very well and even if they could someone cannot hold an expression that is real long enough for someone to draw.
I know someone is gonna say "yeah well what about the Mona Lisa" which is to some some sort of a revelation. It's not. It's portrait 101.