Seriously, what's the reason for not addressing this?
We're constantly seeing Sivir, Lucian, and Corki brought mid for a double ADC + double tank team, because it out-performs a standard ADC + APC team in every way. Very few APCs aside from champions with unavoidable front loaded burst, like Annie and Syndra, can deal with an ADC mid once the mid game hits.
Once mid game hits, there's absolutely no way to trade with them, and you're completely fucked if they get in range of you. If you don't kill them in a single rotation, you're either dead or they life steal back to full.
Something needs to change to stop ADCs from being strong mid picks, whether it be gutting their wave clear, life steal, or early game.