Normal game matchmaking

Why is normal game matchmaking so ridiculously bad? I'm high plat elo in ranked, while in normals I face everything from bronze to master players. This makes the games really stupid, lanes are often decided before the match starts because a diamond player lanes vs a silver. This makes it impossible to actually play serious vs opponents of the same skill. If I meet a silver player I will obviously auto win lane even if I misplay a lot, so this is really bad training for ranked(I want to have decently serious games while not playing ranked due to internet issues) The last game i played, I had to support a non-smurf lvl 29 adc. I don't care if the queue times get a bit longer, don't put people with that high skill difference together!
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