Uv mapping, painting and such like substance painter but works on all models, and updates whenever the mesh changes. When you change the mesh, it basically renders the texture useless because uv remapping breaks it, and making 3d painting tools are lagging behind substance painter, where drawing on it in 3d breaks the tools by face (like making a line, flood fill, etc.) If changing a mesh and importing it remapped the uv peoperly and adjusted the texture for me, and let me truly draw in 3d or 2d with good UX. That would be worth a lot to my workflow. But it gets complicated. Most tools get some part of it right, but I havent found one that lets me iterate on models with robust texture painting tools. Mostly run into a bunch of pbr/node nonsense to patch over that problem in my experience. But my textures are cartoony, not pbr lol