Richard Williams mentioned that he was surprised that Tom & Jerry was done on 2s considering how full and rich the animation was. It makes me think of Mitsuo Iso's full limited style and how you can achieve some powerful animation by subtly controlling what a mixture of frames can convey to the audience. Are 1s really the pinnacle of 2D animation? Do we really understand everything about timing and spacing? The West doesn't seem to be interested in 2D animation anymore and if we're lucky, a Japanese animator manages to stumble upon a revelation once in a blue moon about the medium.
This is what makes me think that we haven't reached the full potential of 2D animation