Seriously, they are. This is by far the most important issue, if they made their asses fatter it would improve viewership. If they made the ponies thicc prudes would complain, which would only draw in even more viewers. Twilight Sparkle, the protagonist of the series has a fat ass, and her teacher Princess Celestia, who's ass is even fatter.
The main reason is uncanny valley. When something looks human but not quite. A perfect example would be a robot trying to mimic being human, it looks unsettling. It's somewhat insulting towards the ponies, you have Twilight Sparkle there a beautiful unicorn and you can't embrace her just because she's not fully in human shape, even though she has all the qualifications to be a sapient-minded
I am sorry about this blog, but anime as in japanese cartoons made in japan are under attack by western moral puritans, because it doesn't adhere to their moral standards. This strikes me as a very imperialistic mindset, not everyone has to adhere to our values.
Crying and cake-eating while watching a porn featuring Commander Shepard and princess Luna.
The famous last words of the person who called the princess fat.
I doubt I'd stick around long enough to see her reaction.
She would be offended. Then she would sob. And now you have a wonderful view on the earth.
1. Cry and eat cake.
2. Get pissed, then cry and eat cake.
3. Sit on my face after getting pissed and eating cake and say, "HOW DO YOU LIKE MY PHAT ASS NOW, HUMAN?!"