Does all life have to use Proteins?

I understand that Carbon, Hydrogen, Oxygen, and Nitrogen are the source of a lot of great cheap chemistry and I understand why aliens could be made out of those elements. I don't understand though why they would use amino acid polymers, it seems to be an obtuse and awkward way of getting things done.

Is there something special about amino acids that necessitate their use by life? Or is Protein something cooked into our make-up because of the initial conditions of our abiogenesis?

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Does all life have to use Proteins?

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