The source data defining a surface frequently creates surfaces that are not kosher and tend to cause problems downstream in the modeling process. For example, there is not notorious triangle:
It would be nice to have a feature that would automatically convert such a surface into tangent surfaces that are NURBS friendly (e.g. cut into four pieces along the red divisions and reorient UV to the new edges).
True, you could do this manually but we’re lazy. That’s the reason we use CAD programs rather than draw on paper. Plus, when you try to do surfaces tangent to other surfaces, the density soars.