Why is there a yasuo in about 50% of my matches. and probably everyones.

okay. i get it. hes fun to play. but it doesnt matter. where is the diversity in the meta? whos fault is that riot? If other champions were as viable as yasuo. wouldn't we see them more. I mean everyone wants to be the cool ninja. like it really pisses me off to see a yasuo on either team in a match. seriously. i mean i do see a lot of lee sins and what not. but yasuo is just stupidly too much in the game. why aren't other champions flashy or updated with new textures and made viable in the current state of the game?. I don't understand why a handful of champions are picked more than the other 100. do I like to fight yorick no but its fun seeing some new champion every once in a while. and I can't get a break playing a niche champion but because of the meta they are just unviable. and useless to play as. its not the fault of the people that pick yasuo. its riot for not giving an equal chance for champions to be at the spotlight. or at least fun/useful/viable options.

just bought fiddledicks. ulted and drained. got two hit by a yasuo/rengar on seperate occassions and died within half a second. how is fiddlesticks viable in this case?