I think at the start, some points may have been to pay homage to the older gens... but basically after staff changes that may have not been the case.
Any, it's weird to me that Scoots wings are they way they are... especially since all the other Pegasus foals that are about her age have the exact same wings as her, though still possible they would have been stunted... but what is really weird is that wouldn't they have grown just a bit more with her? It looks like the animators decided just to c/p her original wing size right onto her supposed adult body... but I could be mistaken