The only thing that matters to me is that the vast majority of my interactions on Reddit are shite ones with negative assholes, while the vast majority of my interactions here are pretty chill. Reddit won't die, but if it did.. I wouldn't miss it one bit.
If you want wide text cool, but There are studies about how our eyes work when scanning text and that anything beyond 80 characters per line is more challenging. There is a reason type isn't set that way, and why we don't have books that are two feet wide. This isn't just some artbitrary stuff that designers make up.
"Wasted space"? To be filled with what? Providing a comfortable reading experience is paramount, not filling space. From a UI perspective I'm not sure that there is a sensible alternative.
I don't disagree