@Gijs just posted this…
…and I just have to ask, is that improvement that RefitTrim can now handle a trim curve (or multiple trim curves) which don’t cut across the entire underlying surface? 
It’s been two years and I’ve still not come across a single practical use case for this tool, since in exactly zero real world models (which come across my desk) are surfaces ever perfectly and cleanly trimmed across one side only.
EDIT: Also just saw this from @Rhino_Bulgaria. 