In those super high detailed early models of the ponies, both Zipp and Pipp are rockin' some very impressive hoof feathers as you can see in the image above. One of the talents behind it has answered why they were removed in the comment section of one of the posts created yesterday.
We've got a screencap of the conversation below!
So, the general jist of it is, the feathers got in the way and were hard to animated with ponies being all expressive with their arms and stuff. Sounds about right! Now we need to figure out how those hooves work, cause they seem to grab anything they please.
Thanks to Sweet Notes for the heads up!