Why are Crits still a thing in 2015?
Ashe deals extra damage against frozen targets Kalista stacks up extra damage for a pay-out later Draven deals extra-damage if he can keep catching axes Vayne deals extra damage with consecutive hits on a target Fiora deals extra damage to vital points
etc. etc.
There is no need for Crits in this game when Riot is perfectly capable of crafting interesting bonus mechanics for attack damage carries
Crit is basically just the snowball stat that either doesn't do much (you're behind), a gamble (even) or just further shits on your opponent (you're ahead). For no reason. All of the mechanics above have a reason to deal extra damage reliant on a circumstance or player skill.
Even LCS games are decided by the one lucky crit that finished somebody off and secured a base push and win.
Why is this still allowed?