you may habe something here, I play -50 through +400. Isn't that the way to get better, play better opponents?
The way to get better is to review every game you play, after you play it, to find your mistakes, and to find the better moves that you should've played, instead.
If you just play, without reviewing and learning from your games, you'll find it difficult to improve.
Chess is very interesting in that it can play itself at some stages or for some time. Develop or improve a piece and consider yourself playing good chess automatically, while it is actually the piece itself that merely shows its power. It is the other way round with musical instruments; they will not play themselves. So I think all this rating stuff and blitz action below GM level is deceptive. And the poster fell for it.