We find scraplets cute because we are wired to find anything with “baby-ish” proportions cute. I would like to think that the inverse is also true and that Cybertronians find babies nightmarish because they look like scraplets.
Like hanging human baby pictures around is enough to keep the more queasy-stomached Cybertronians away.
But on the flip side some of the bots are into them just like some humans love monstrous designs or horror movies.
TFP Bumblebee has a bit of a baby face, maybe he thinks he’s intimidating because of it?

He changes his appearance sometime before RiD2015 pretty significantly, maybe to make living on Cyberton among his kind again easier? I mean it’s not just a style change between shows, the whole form is different and his head and optics are less round.
No more baby face.

This is interesting but I don’t think the writers thought it through that much.