Though we are happy to see them in their ‘grown-up’ versions, but in Scoot’s case, there is hints of sadness and disbelief to see her wings are not fully developed. This really gives a strong impression that Scootaloo is indeed have a disability, that more likely she will not be able to fly by means of using her wings for it. This disability didn’t bother or broke her emotionally, as she remains strong and continues to inspire other ponies (but most especially us) whom looking what’s their purpose in life.
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Based on “Growing Up is Hard to Do” MLP Season 9 episode 22.