"Riot is making every ADC have 70-100% crit chance at late game!!!"
I posted this on another thread, and for some reason, nobody replied.
I think that the reason why Riot is making every ADC have the possibility to crit on most of their attacks, is to allow crit to be less random. This can allow Riot to balance them better. After all, people are complaining so much about how crits are random, yet they are mandatory on every ADC, and give too much of a powerspike.
This is also the same reason why they lowered the overall AD on marksmen (their items have reduced total AD). This is one of things they are doing to address the crit problem.
Another reason why I think that people complain about crits, is due to their synergy with some champion's abilities or passives. For example, Yasuo gets double crit chance, and Jinx can have AoE crits thanks to Fishbones. This makes crits be way more powerful than they should be. But I don't think that crit should be removed, as it is a necessary mechanic to allow ADCs to do significant damage late game. An auto-attack that it is not backed by crits is not going to do a lot of damage, unless you can compensate that with on-hit effects. For example, Vayne can build Phantom Dancer as her only crit item thanks to Silver Bolts, while Kalista can build no crit items, thanks to Runnan's Hurricane and Rend.
Also, as much as I hate Yasuo, if crit was simply removed, he would become completely useless and would have to be reworked. He is completely reliant on crits.