It would be nice if Riot stopped this "everybody should be around 50% win rate"

It's evident to me , after playing for 8 seasons and having changed servers, that when someone gets more wins than losses, at some point the system matches him with really lower teammates. That is the idea of a competitive game, that Riot has for league of legends. I know that you have a business to run and make money, but frustrating the players is a shameful thing to do. If someone gets a high win rate, just match him with better teammates and better opponents. There is no need to "punish" him. E.G. Don't tell me that the above doesn't happen. It's a fact, 5 different people monitor it.