I think the point is that 60 fps is not a representable value in the gif binary format, just like (int pi) can be either 3 or perhaps 4, but never a transcenden

I think the point is that 60 fps is not a representable value in the gif binary format, just like (int pi) can be either 3 or perhaps 4, but never a transcendental number. You can have a magical decoder that circumvents this, but that's no longer a gif.