First of all it wasn't a serious suggestion. I was making humour off the fact that you suggested human world ponies are less intelligent than Equestrian ones not making some mean spirited dig at Derpy for being different. Geez, relax.
Secondly you forgot that the issue revolved around 'human world' ponies not actual human beings, I know how the EqG dynamics work regarding transformations.
And finally you didn't address my question regarding the possible use of magic spells to alter a human/pony ' s appearance in either world. Is this conceivable in your view? Hypothetically I think it would be possible albeit likely requiring immense magical power.