A lot of their game logic times based on "game cycles" instead of something proper like counting seconds. ScummVM runs a lot of old Sierra games; it applies some patches to game scripts to fix these issues and also throttles some stuff to make it run at a proper speed on modern hardware.
I played God of War (2018), the Last of Us games, and some other stuff on PS Now (Sony's cloud gaming platform). There were some issues but overall it worked pretty well. There are some games where cloud gaming can't give you low enough input latency, but I disagree that it is as many games as you think.