Agreed, but the default setting of 1 doesn’t give you a surface with equally spaced control points. And moving the position of these is just by sliders (EDIT! Complete nonsense! It’s curve blending that is just by sliders, please ignore this comment!!! Sorry…) which makes doing a long run of blends quite tricky. Lots of going back and manually making sure that each surface matches up to it’s neighbour.
However, you get a different result by using the ruled surface then match method (equally spaced control points).
Not complaining (well, kind of…) but just giving a heads-up to anybody using the blend surf tool.