There's a lot of work to take advantage of perceptual quirks of human vision that happens in tweens by humans that these algorithms don't account for (at least

There's a lot of work to take advantage of perceptual quirks of human vision that happens in tweens by humans that these algorithms don't account for (at least last I knew). Sometimes a perfect interpolation, or even something based on a physical model doesn't feel right, isn't what is expected.