Animal set class bound?

Why are the animal sets class bound on acquire? I understand that there are other class-related skins like Alar which make sense to be class bound. But this? These are joke suits for your characters, why can’t you use it on any one of them?
I’m not even going to mention Starting Novice Hairpin and Diligent Bunny Headband (cries)

Because they don’t think that far ahead.