Why is autofill needed in low elo?

Seriously, why is there autofill in bronze, silver and gold? I would greatly prefer to wait longer queues than having to play a third lane that i have no experience on, which would make me tilt most of the times. I know some people will say that 1 out of 10 games isn't a problem getting autofilled but still prefer losing on my own lane and knowing it was mostly my mistake for playing badly than just my lack of knowledge on a 3rd lane.
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