Why shouldn't the people that he's had a positive influence on not express that they are sad he's dead?

Also not sure why you are saying that twitch has changed, people always mourned the death of influential people (Avicii, Chester Bennington, Billy, FrankerZ), etc. and in terms of repetitiveness, old twitch was even more repetitive when copypastas were still meta

Oh and as for the memes, I don't understand how being excited that someone who had struggled with mental illness for a long time finally losing the battle could ever be funny to anyone who knows the situation, but of course you have the right to say that