Whats the point of showing makeover of nerds in fiction and movies?

It means if I don't wear makeup, guys won't chase me? Lol, it's just not girls. In crazy stupid love even the hero goes through makeover. In his case, it can be essential since married people tend to slack off, well I'm not married so I can hardly be a part of debate when it comes to him.

What do you think?
https://youtu.be/lYvxgYLq3co
Whats the point of showing makeover of nerds in fiction and movies?
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