I've been experiencing screen issues on my 2016 MBP since upgrading to Big Sur, and Monterrey did not resolve them. For me, the issue appears in the web browser, both Safari and Chrome. Not all pages cause a flicker or static, but certain sites are terrible. (I read somewhere that this might be related to javascript on the page.) After reading a lot of potential fixes for this issue, like making the cursor bigger in Accessibility and running a javascript animation in the background, I still had some web content giving me fits. I first had luck by boosting my screen brightness to the maximum setting, but that seems unsustainable, batterywise. Poking around in Display settings, I decided to change the color profile, and I found one—SMPTE RP 431-2-2007 DCI (P3)—that made the flicker disappear completely, no matter what my brightness settings were. Then I decided to tinker with the default color profile—Color LCD—and found that adjusting the white point in Display Calibrator Assistant made a huge impact on my screen flicker levels. Some settings made it worse, some better. Find the one that works for your display and save it as a new color profile called Reduced Flicker.