Unironically this is a wrong statement.
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I agree that it does not take much to reach from 1 rank to another especially for lower elos.
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I see statements like this and as well as between higher ranks too.
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It's more so the wording is wrong. As there is still a separation from a hardstuck iron and a hardstuck silver. Same can be said between hardstuck bronze and hardstuck silver.
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If they were be exact same, then one shouldn't be stuck in silver and able to reach gold.
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A gold can very much solo a diamond, but that doesn't apply they are the same.