> But even with that it's STILL possible with the right setup using xrandr where you essentially render at a higher res and then downscale. You actually don't

> But even with that it's STILL possible with the right setup using xrandr where you essentially render at a higher res and then downscale. You actually don't even have to do this for updated programs - hidpi aware applications scale themselves, vector graphics style, so there's no up then down scaling going on. And applications can easily read the xrandr config and adjust their factor when moved to a different monitor. However, xrandr's ppi factor is not the scale factor you likely want, so this isn't really standardized; each toolkit might do it a bit differently. But all the pieces are there. Non-aware applications might be bitmap scaled if needed though. (Of course, wayland just breaks all legacy applications anyway so that sets the compatibility bar low regardless)