Earlier quoted context omitted.
My indicator for if Apple is for the customer vs for Apple is how macOS 'negotiates' YPbPr instead of RGB for non-Apple branded monitors (some LG monitors also get a pass) which results in worse color quality. I believe this to be carefully engineered to be a plausible bug rather than a real one. BTW I have found a workaround using BetterDisplay and an EDID override (to more closely match what the monitor is actually…
I ran into this issue with the Sonoma update. My display (4k LG) was negotiating RGB just fine before, but not anymore. The BetterDisplay workaround hasn't worked for me. The poor colors and fuzzy edges around all the text is causing eye strain too. I'm beyond furious.
FWIW, here's the hacked script[0] which only keeps the EDID data patching part. Be warned it's very hacky with the base64 EDID to be patched hard-coded in line 8 of the script. It prints out the patched EDID base64 which should be entered back into BetterDisplay (which is also where you can get the unpatched base64 EDID).
[0] https://gist.github.com/karmakaze/f795171a6a795491e754c3d092...