IIRC, Disney was investing heavily into computing starting in the 90s, including inbetweening automation. Even John Lasseter promoted computer-generated imageri

IIRC, Disney was investing heavily into computing starting in the 90s, including inbetweening automation. Even John Lasseter promoted computer-generated imageries as a way to reallocate animators' time from "gruntwork" to more creative processes. In Japan, most of animation still involves paper. Inbetweening is treated more as a craft, and the best animators still do inbetweening for top-of-the-industry projects like for Studio Ghibli and Studio Khara.