You’re right that is a continuous process, so there’s no frame rate as such. 24 fps is just the lowest framerate that doesn’t look “framey” in videos, but can go as low as 12 and still reliably perceive it as movement, which is why most stop motion films are done at 12fps.
The amount of motion blur we see on fast moving objects is similar to a 24fps camera with a normal shutter angle setting, but we don’t perceive any blur when we turn our heads or move our eyes like a camera at that fps does.
There’s also our reaction time, which can vary a lot depending on a plethora of factors, but averages around 250ms, which is similar to 4fps 😅… Or maybe since it’s a continuous process it’s more like ♾️fps but with a 250ms delay 🤔😅
The water still looks better than some new games today 😅