NewDwarf thanks for this command. I'm on mbp 16 2019 currently and when i'm turning off intel graphics dithering disappears or its less noticed for me. In logs I can see when dither back to enabled state when I switch back to intel graphics
2023-02-27 20:26:56.712467-0800 0x3ab   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-27 20:31:37.918594-0800 0x921   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-28 09:20:01.660853-0800 0x8c2   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-28 09:20:01.998073-0800 0x3ab   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-28 09:44:22.632784-0800 0xa2c   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-28 09:56:26.359148-0800 0x9dc   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-28 09:56:26.442904-0800 0x3ae   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1
2023-02-28 10:22:31.855934-0800 0xa2c   Default   0x0         0   0  kernel: (AppleIntelCFLGraphicsFramebuffer) [IGFB][LOG ][DISPLAY  ] [Modeset]
Dither
is enabled with bpc 1