@alcinnz
I have no direct experience with classic Windows display driver development, but I found this article interesting:
https://www.os2museum.com/wp/display-drivers-os2-and-16-bit-windows/
Three exact details are glossed over a little but I found it interesting that at this point it wasn't clear what different display hardware might have in common yet, and so essentially the entire graphics stack was reinvented for each driver.