Riot, I just can't understand your logic on crit

After having my own frustrations and watching LCS games where the announcers flat out say, "So and so lost that due to being unlucky with crits" I was PRAYING that with the big S6 changes AND Marksman update that you'd finally use the opportunity to remove the critical strike stat, just as you removed dodge so long ago.

Instead, you go full ham opposite and make crit easier to get, put it on more items, and make a mastery that crazy synergizes with crit. What the hell? I can't even begin to imagine what you are trying to accomplish here gameplay/balance wise.

I'd love some sort of explenation of why you went down the path of making critical strike, a purely RNG/no skill stat, even more prevalent in your game?