[itwillnotbeasy]

Isn't support for external displays is a basic functionality, that is expected to be handled by the system? MacOS makes sub-4k monitors pretty much unusable for people with good eyesight who works with text a lot. Yet Apple haven't fixed the jaggy fonts in a years, they deliberately made it worse by removing subpixel anti-aliasing.

[karmakaze]

Not only that, but macOS routinely (or aggressively) likes to treat off-brand(?) monitors (e.g. Dell) as a YPbPr device rather than RGB that adds to the blurriness. You can override that by generating and installing a custom EDID display profile. This is mentioned in the post and it has been a recurring problem for me.

With recent macOS versions, I've often had displays auto-negotiate with 30 Hz refresh for no apparent reason, and only sometimes.