The biggest difference of adc's from low to high elo I've seen.
I've played supp with d2-d1-master-challenger adc and now when I'm playing flex q with plat adcs... I see a big fuckin' difference (obviously). Plat adcs don't know what aggression is. For example, I single handedly made enemy supp to 30% hp by poking the hell out of him.. and what does a plat adc do ? Farm cs behind everyone and does nothing... whereas high elo players would go in front of enemy cs and bully/poke them with me so they can't even cs, so they can just wait until it pushes to their tower and do nothing else. Seems small, but it's such a big difference, I can't understand why would you let enemy bot lane farm if one of them is 30% hp, just go aggressive as fuck and deny them everything. Of course ward up before that. That's it. You can win lanes from lvl 2 power spike hehe xd like that. Don't just stand there like a fucking tree and expect kills fall into your lap.