That video has almost no relation to the show, though.
It's just the happy sunshine unicorn horses magic sparkle candy pink "cliche" that happens a lot in comedy/girl fiction.
MLP didn't invent anything in that video.

rip, puffin the fluffy pony :c
Also, the artist came up with a new breed of fluffy ponies, ones that don't talk in a baby voice, are slightly bigger and grow plants on their back, they are called garden fluffies:

Unlike fluffy ponies garden fluffies openly welcome death and can't be "tortured" physically, since they are happy that when they die they'll help plants grow.
However showing them dead crops (or pieces of toast) forgets with their heads.