Mesh transform is extensively used to create animations and warping perspectives. The most useful kind of warping is emulating perspective and rotation. Gaussian splats allow more intelligent warping in perspective without manually moving every vertex by eye.
Foreground-background separation is entirely uninteresting. Masking manually is relatively easy, and there are good semi-intelligent tools that make it painless. Sure, it's a major topic discussed within AI papers for some reason, but from an artist's perspective, it doesn't matter much. Masking out from the backing is generally step one in any image manipulation process, so why is that a weakness?
Foreground-background separation is entirely uninteresting. Masking manually is relatively easy, and there are good semi-intelligent tools that make it painless. Sure, it's a major topic discussed within AI papers for some reason, but from an artist's perspective, it doesn't matter much. Masking out from the backing is generally step one in any image manipulation process, so why is that a weakness?