Agreed, and already suggested on the Dynamo GitHub: https://github.com/DynamoDS/Dynamo/issues/6566
In the meantime, simply use Surface.TangentAtVParameter
and Surface.TangentAtUParameter
to generate planes using the Plane.ByOriginXAxisYAxis
method. Its inefficient (thanks to the number of profligate tessellations) but better than nothing: