If we buff crit again, we're just moving in a circle
Seriously, originally after the assassin rework we had adcs dominating later into the season with the broken Ardent Censer and all. But the main issue was obvious: adcs did too much burst damage with crits. This made assassins (and to some extent bruisers) bad, so Riot buffed them and made some of them do even more stupid damage to be actually able to deal with adcs again. Now Riot has finally changed crit to be less bursty and broken, next step is to tune down assassins/bruisers who can instakill adcs. But if we're gonna buff crit back, we're just moving in an endless circle of making things do enough damage to oneshot each other left and right. Which has honestly become boring and should really stop at this point imo