>>109032309I'd say there's a difference here.
Ponies were ponies. Made to be cute small horses, doing cute small horsey things in their cute small horsey world. Suddenly Human School is ... a jump, to say the least. I think it - well it could have worked out a lot worse. Remained a cynical cash grab toy-wise of course but the animation had its good times.
SHG - well, the entire premise of the property is that they're de-aged and at school, or at least of school age, so the transformation objection has already been overruled. And it's also not as much of a stretch to imagine existing characters simply as younger versions of themselves, Muppet Babies as one prime example and if I was all that bothered about it I could look up others.