Hum.. I wonder if having the Series S running FSR2 Performance mode with 1440p output (720p internal) wouldn't put on a pretty decent result. The Series S waas supposed to be a 1440p cinsole after all.- DF mentions that FSR 2.0 requires a significant ms time in the rendering pipeline which explains could be why it wasn't in the Series S version
Or they could get a "120Hz resolution" mode for the Series S with FSR2 Quality 1440p (1080p internal) but with 40FPS.
In the end, this looks like a very light or at least well optimized game. The Series S should have shined on this title.