Just for the record, even if the UVs and textures must be totally redone there is still a need. It is a skill that you just need to have,

1. To make meshes simpler, (from zBrush)
2. To convert to quads from tris (from Marvelous Designer)
3. To make mesh cleaner, more beautiful (from Sketchup. Yes, beautiful mesh is more valuable :)

And doubtless in many other cases too.