You could never tell if the framerate never drops. But even then, they could poll the input and logic at 120 or 240 Hz, same as racing games, and keep controls even tighter than a locked 60 fps framerate sync'd experience could offer. Uncorroborated Google suggests PS4 polls 250 Hz from DS4 and XB1 polls @ 125 Hz.
There are a bunch of pc ports where folks complain about slo-mo when they set the graphics to max on their toaster.
Or... varying damage based on frame rate (dark souls, iirc).