Another proposition for a vast improvement of the Blend surface is to have an option to influence the control handles by the adjacent edge direction with one of the following settings:
a) Match target edge direction;
b) Match target surface isocurve direction.
That will completely resolve the issue with randomly shaped blend surfaces that require extensive work to be fixed afterwards.
This is where even Match surface’s “Match target isocurve direction” was unable to properly “read” the actual isocurve direction of the adjacent surface:
