Why do females obsess so heavily on appearance things that don't matter much (makeup, accessories, hair) rather than what does matter (weight)?

Seriously I see my female friends constantly saying shit like "her hair and nails are so on-point, omg!! she looks amazing!" for whatever chick or whatever Insta celebrity just posted a pic or whatever, and chick looks like this:
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So... why do females think that in ^ this situation, hair and nails and makeup are the point. Is it simply because they're easier? It's simple laziness?
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This was a rhetorical question.
Why do females obsess so heavily on appearance things that don't matter much (makeup, accessories, hair) rather than what does matter (weight)?
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