If interested here is a little secret using loft in c#, you can get always a single untrimmed surface no matter the curves (even with sharp angles) if we just output it as its surface form without splitting at kinks as Gh+Rhino do native. Then you can use this surface as you would a single surface in gh, divide it, evaluate it ect. (but if you bake that surface into Rhino it will become split at kinks - unless you turning off CreaseSplitting before the bake in Rhino which is not recommended). Works good for wanting to treat polysurfaces like surfaces for surface divisions (mostly when curves are more uniform you get good divisions, in this case it can get a little angled, however I’ll share anyway).
LoftUnsplit.gh (10.8 KB)