My average accuracy is 79.8 in blitz....but i am 1900 here....how?
Because accuracy doesn't mean much outside of high level classical chess.
In all other cases rating doesn't matter anymore than time control, playstyle, and large factors that happen in some games but not others. Some of these large factors can be long-drawn out endgames, a long series of forced obvious captures that might end up being the correct line. An opposite colored bishop game is the most obvious and classical example.
Long story short your accuracy tells you more about these external factors and less about your overall strength, which is something that your rating does.
The correlation I presented was quite strong between accuracy & rating. I disagree with your statement that accuracy isn't important outside of high-level chess. Individual games may have much different accuracies for an individual rating, but the average accuracy through several games is clearly relevant.
My average accuracy is 79.8 in blitz....but i am 1900 here....how?
The correlation I did was for rapid rating & accuracy. For blitz and bullet, the accuracies would be much lower with the associated rating.