This game lacks checks and balances. How does a design like Jhin gets through?

I am sick of this cancerchamp who is in all my games. His ult is complete bullshit. It is used to start a teamfight, catch someone at ridiculous range and kite him to death, at the end of a fight, it deals way too much damage and the huge slow makes it easy to never miss after you hit. Then you have those invisible traps which again help you catch someone from ridiculous range with your ult. Then we have a ranged root to again kite and catch someone. His 4th shot does a ridiculous amount of damage even in lane. He can keep it up and just zone you and keep you behind. He has waveclear, is a lanebully and carries games with his ridiculous ult. Even streamers who play him call Jhin a retarded champion who is too easy to abuse. WTF is the designteam doing? Do they even think or test champs prior to realize or just come up with bullshit kits 'that are unqiue and overloaded' and just throw it out in the game and 'lets see how it works out'?

• His ult really needs to get tuned down a lot
• Take gamebalance into consideration when designing a champ THANK YOU VERY MUCH