Display Port has fancy features like Display Stream Compression where the driver compresses the image going to the screen.
The solution would be for MS to move those features into Windows rather than allow manufacturers flexibility in implementation. MS would get bad publicity for monopoly and then have to deal with fixing Windows for every off brand monitor because the manufacturer didn’t follow the standard exactly.
That’s a bunch of words, but they don’t really answer your question about why a monitor needs 3rd party drivers.
Display Port has fancy features like Display Stream Compression where the driver compresses the image going to the screen.
The solution would be for MS to move those features into Windows rather than allow manufacturers flexibility in implementation. MS would get bad publicity for monopoly and then have to deal with fixing Windows for every off brand monitor because the manufacturer didn’t follow the standard exactly.