Yeah, that part is pretty crazy. I wonder if that is just up to the game developers, or if they were given a limited compute budget and the current 1080p / 1440p base resolutions were the best they could get? Maybe Stadia can't deliver the needed latencies at full native 4k?

Unless I am misunderstanding, the 4k up-res is happening on Google's side, so it's not like they are skimping on bandwidth.