Crit should be removed
Crits use pseudo rng
20% crit chance: P(C) "probability of getting a crit" = 0.2 q=0.8 applying the binomial distrubution: let's say an ADC hits 10 times. n=10
E(X) (expected value)= np= 100.2=2 V(X) =npq = 100.2*0.8 =1.6
When an ADC gets an IE, with 10 attacks he will get approximativly 2 crits, it can go beetwens 0.4 and 3.6 crits, Do you get it? if an 2 adc fight each other one can have instantly a crit, the other can wait 5 attacks
which means if an adc gets more crit earlier he can burst the other adc with some spells like buckshot/collateral damage for graves TLDR: Crits are fine late game when adc has 50/60% crits, but in early game, it's all about luck and rngod and if they are in your side the snowball begins.