We've come full circle, games are now 100% bottom lane

Quite literally 100% of my wins and losses are directly caused by bottom lane winning or losing in the first 5 minutes, before anyone has a chance to influence the lane. I just demoted to Platinum II after going 15-3 to Diamond promos, because if my bottom lane loses, the enemy ADC just rotates to mid lane and basically 100 to 0's me in 2 seconds. This is out of control, and I'm really not sure what the balance team was thinking.
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