Why has the game become unbalanced/not fun anymore?

Why did Riot add so much 100% to 0% stuff to the game? I'm regretting investing real money in this game, considering where it is now. I can't play it anymore like I used to. Best example is a fed 6 stacks Cho getting 1 shot by Zoe. First they called it the "tank" meta, now it's "1 shot" meta? I'm seriously considering not coming back to the game anymore, as a lot more people are. Riot you might as well rip off from Dota the duo top too and let the jungle farm for the carry and remove the jungle role completely. That's the direction the game is taking and it's not gona get better. Get your stuff together Riot.
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