I'm using Linux for ~20 years at this point. I remember fine tuning X.org after than that to fine tune behavior of ATI and nVidia drivers back in the day, around 2007-2008 IIRC.

While most of the work has vanished for single monitor setups around that time frame, multi-monitor setting wasn't very reliable and deterministic under xrandr came around and drivers added native support for that.

*: randr came around 2003: https://cgit.freedesktop.org/xorg/xserver/log/randr/randr.c?...