It seems like most people are dealing with it this way.  However, has anyone figured out what to do to get window and door jambs to show correctly in the 2 wall types (one existing to remain core only and one new finish only) method for handling showing new finishes on existing wall?  I find that the windows or doors I use it cuts through both wall fine, but the jamb and what not only goes the depth of the host wall even though the core wall and the finish wall is joined together.  I thought perhaps it requires modifying the families of the windows and doors, but that seems to defeat the purpose of revit.  Shouldn't we just be able to phase finishes?  It seems entirely absurd to me that revit hasn't figured this out yet...?  Or is there another method now and I've missed it.  Any help would be appreciated!

Seems like Revit hasn't gotten any better for renovation projects.  Strange, given that is like half the game in the world of changing the built environment.