Why does rank still have duo q when there is flex ?

I get that they wanted it to be for playing with a friend etc but flex is there for that now. Why have something like duo q in ranked?> just played vs a bot lane duo q when we were not and the difference in communication is rather absurd. Same when a jg mid is duo ...just seems like such a huge advantage in solo q rank. Why not just let solo q rank be that solo q and let those that want to q together use flex ?
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