This is not a community issue, its a balance issue. Why play so or so champions, when this champion is just better in almost every situation. Thats where we are at right now. The "meta" has become who can 1-shot the fastest and most efficiently or who can do the most damage to the most targets. Those champions are mostly assassins like Kha, Rengar, Eve, Qiyana, and Pyke. They not only 1-shot most champions instantly but they can kill multiple champions at once by themselves and are incredibly hard to pin down or peel against. So again, why pick a mage that has to land skillshots when you can jump in insta-kill the carry in 0.1 second, and then kill anyone who chases you. The other problem champions are like Yasuo, AP Malphite, Draven, Sylas, Fiora, Riven. Who do a shit ton of damage, but are also incredibly difficult to kill which gives them an advantage over a champion that is only one of those things.
Its a lot itemization, but also individual champion balance. Champions like Pyke who see no nerfs for months despite being pick/ban, are overtuned and have ridiculous damage numbers.
Sure it would be nice if everyone just agreed not to play the clearly broken champs, but this is a competitive game and thats totally unrealistic. They need to balance the game properly and move away from the 1-shot meta they have now.