True, but a person can only do so much to improve the quality of the images/video footage.
This is true although I have seen some pretty amazing shots that people have taken with iPhone.
Unfortunately they will only end up posting the best of the best pics I'm sure... So while the posted photos and videos may look real good, I'm sure there will be plenty more that we never see.
But that's the case for all photographers and that's why pro photographers take thousands of shots (we never get to see) just to get a few images they can use. Doesn't make any difference if it's a DSLR they are using or an iPhone, they'll still only show the best...which makes perfect sense.
**EDIT** I've just realised that a few others have mentioned exactly the same thing above!