Why doesn't Blizzard fix the weird twitching of the image?

The game has had a problem with strange micro staters for a long time, and it doesn’t matter what FPS you have, 60 or 240 doesn’t matter. If you change any of the graphics settings during the game, the image becomes smooth as it should be, but after restarting the game, the problem returns. Monitoring like MSI afterburner does not detect any twitching of the image.
People have already asked this question on reddit and other forums, but they have not found an answer.
I ask Blizzard not to ignore this problem and finally solve it.