As someone that creates a lot of Revit families, I always appreciate Revit enhancements and new features that help with creating or working with families. Reference Planes are a critical component of families and Revit 2017 has some interesting changes in regards to them.
When creating Revit families, it is important to easily see the entire family model in plan view while you are creating or modifying the family. While this may seem obvious, by default Revit does not necessarily provide this ability. You may add some information, such as an extrusion, to the family and have it “disappear”. I have “been there, done that” when I added an extrusion based upon a higher reference plane and then had it disappear when I finished the extrusion. If you don’t understand what just happened, it can alarm you and frustrate you.