Why bother have an elo system?

Does the elo system not apply in normals? It seems so, god %%%%ing damnit. Why bother having an elo system if it only works for certain game modes? I don't care that it's normal, I don't wanna demolish or be demolished just because there is a diamond in the game. I am surprised that as a silver player I haven't met any master tier players or challenger.
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