Great that the new version keeps the system types for demolished MEP elements, however, there is a problem. Demolished elements keep connectivity as well. This is an issue, for instance, if I delete a section of ductwork to allow for the connection of newer ductwork (or a piece of mechanical equipment) you cannot connect to the end that was demolished because the previously demolished section is still in reality connected even though in no longer shows up.
This is a complicated oversite for those that actually use Revit's phasing capability.
