There are SO many use cases! I maintain we're not even scratching the surface here. You could programmatically reskin video based on crowd participation, you could re-texture VR spaces on the fly. The space of cool shit that you can do with this stuff is growing far faster than we're able to explore it right now.

It has been a while since I last tried, but I never had very good results when I tried inpainting with SDXL in comparison to the SD1.5 inpainting models.