You do know that people are more likely to voice how much they don't like something than it is for them to say how much they like something? This isn't unique to league either. This is the same in every single thing in existence. You are more likely to find people bitching and whining about literally everything on the planet than people being grateful about stuff. The only time you will see people being grateful and talking about the positives are when charities and people doing incredibly good things are involved.
People are so fickle and so quick to change their mind that it is literally pointless to argue with anybody over the internet. Why should riot or anyone for that matter argue with some random person that they don't even know over the internet? Chances are this random person has zero interest in changing their opinion or having meaningful discussion and just rather circlejerk and hate on stuff because "it's the cool thing to do" or some other nonsense. Just say your piece and if that leads to good meaningful discussion then awesome if it doesn't? Stop and move on.
People have been saying that "league is dying" and "this is the worst season EVAR!" since season 2 at the bare minimum. The game is still in season 10 and still breaking records every single season. People are constantly whining and bitching about every single little. Never satisfied. It gets really tiring hiring the exact same baseless nonsensical garbage every single season. If it lead to some actual good and meaningful discussion it would be one thing but it literally just devolve into a "you don't agree with me? I refuse to even acknowledge what you are saying"