The RefitTrim command, new in Rhino 7, allows users, with high end surface modeling needs, to convert a trimmed surface into an untrimmed surface when possible.
This is an excellent starting point to create higher quality transitions between neighboring surfaces.
The new 4 edge NURBS patch is simplified and can then be used with any command for downstream surface creation. Check it out!
Key Rhino 7 enhancements for Windows and Mac
Of course there is more. These are some of our favorites enhancements in Rhino 7: