As an adc main i wanted our lane to have less attention, I didnt want my entire role unviable
Well, we could have just reverted the cost reduction to crit items, but we didn't want to do that. We could have done something about the admitted problem that theres too much damage coming from the support role which is why bot is so volatile, but we didn't want to do that.
We're just gonna make the entire class unviable.
Now that crit marksman need 3 items to do damage, rather than a zeal + old IE, you do crap damage for even longer, but the best change is this: When you've reached your power spike, the games already over, cause we've been shoving 20 minute games down the barrel since November.
Better nerf irelia turrets
and only 1 of them builds crit, and that's Draven, who can do damage already and can get the gold faster. You know who the worst 5 five are? 
All of them mostly crit/attack speed based and YES take 3 items to do damage and games already over when they hit that power spike. You GOTTA adapt to it. Don't be TSM and play week 1 meta at worlds in week 3, it WON'T work!