The game will never be balanced to accomodate you

"I'm a Yasuo main. I only play Yasuo. I only play Yasuo mid. I refuse to be anything else. I throw every game that I can't be Yasuo mid."

Well hello there, subhuman. While we wait for the poison dart to kill you, consider this:

There will never be game balance, at least not with the way you play right now. One tactic, one style, one champion, one game mechanic does NOT rule them all. Yasuo doesn't counter everyone; you know this already, but when you get demolished by the enemy, you quickly shirk the blame onto someone else, like top lane intentionally feeding Renekton (even though all his kills were from you) or the support not warding (even though he did, even when he should have been bot lane, but you wouldn't shut up about him not warding YOUR bushes, and you just ignored it anyways). You use the exact same champion, item build, and tactic for every scenario. Not only is that stupid, completely nonviable and counterproductive, but you aren't the only person that does that. Most people main assassins in this game, and this overspecialization means that there is absolutely no diversity in most teams, which means it just takes ONE enemy player with the slightest bit of awareness and adaptability, ONE champion, or even ONE spell to completely destroy an entire homogenized team.

For anyone who knows anything about agriculture or virology, a lack of genetic diversity is what leads to massive crop failure in real life, and has already led to the near extinction of one breed of bananas decades before most players in this community were even born, including myself. Bananas are completely sterile; part of the stem of a banana tree has to be transplanted elsewhere for another tree to grow, which basically means every banana on the market everywhere is the exact same banana on a genetic level. For most species on this planet, including humans, there are subtle variations in genetic codes as a result of reproduction and exposure to different environments, which long story short is what causes resistances and allergies. If we didn't have those variations, the entire species could get brought down by a single strain of virus (granting that we didn't have the medical advances we do now).

Likewise, a species that overspecializes or is entirely dependent on a string of factors to thrive will go extinct first the very instant the environment changes even slightly, apex predators being the prime example. The saber-tooth tiger is one such example. After mastodons and mammoths died out after the end of the Ice Age and the saber-tooth depending solely on large prey and suddenly facing competition from another emerging species that was much more adaptable than them, they quickly followed the mammoth to extinction.

League is a microcosm of the natural order at work. Homogeneity is anathema to nature, and anything that can't adapt or change is quickly snuffed out of existence, and even though scientific advancements have some what controlled the natural order in our favor, it hasn't completely stopped it. Remember the bananas? The breed of banana we have today have the exact same flaws of their cousin from 50+ years ago, as in they are sterile, genetically identical, and currently being demolished by a new strain of bacteria that brought the previous banana to the front door to extinction.

So yeah, you can overspecialize all you want and focus on only one role, one champion, and one tactic, but it's not going to do you any good. Anyone who adapts even slightly will find a way to destroy you each and every time, and you'll never advance any further than where you are right now. And if you think you can just refuse to compromise and expect (or force) the person next to you to adapt for you, think again. He has the exact same thought process you do, same with the person next to him, and the next one, and so on. The uncompromising, non-adapting attitude is the norm in the League community, where most will absolutely refuse at all costs to even try anything that isn't what they decided to focus exclusively on, which happens to be assassins and ADCs. The game has basically moved on without you; overspecializing is a BAD idea, and there will be no concessions made for you if you continue down this path.

But don't worry; your corpse will be recycled to feed the next lifeform that comes along. Hopefully they prove to be more promising in life than you.