@Riot, Can we get a red post on why the "Hidden MMR" system is > "just play against your rank"

I'm not saying I am for or against MMR, but I would just like to know why I am for or against. thanks! Edit: What I mean is that why not MMR just determine how much LP you get per win not WHO you play. For example, if im Silver 2 I play Silver 2s, if my MMR is high I just get more LP. Edit 2: Or return to the old ELO system. I was not a round in those days
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