They just don't prioritize low latency enough to implement such a feature. They're probably more focused on power efficiency. The overlay solution is better (al

They just don't prioritize low latency enough to implement such a feature. They're probably more focused on power efficiency. The overlay solution is better (although it's not free wrt power consumption either). It's just lame that Nvidia and AMD don't support it. To be fair, it is difficult for applications to support <1 frame of latency even when the compositor allows it. It requires precise timing and very predictable rendering performance. Even VR applications struggle with this, despite the fact that the consequence of latency and/or missed frames isn't just a floaty feel to the mouse pointer, but literal nausea.