OOTB attributes are only synched from CAD Doc to WTpart on check in or build operation.
Due to requirements for searching, workspace listings, cad integration which can not be solved by the ModelAttributDownload Delegate several attributes need to be persisted on both objects. In this case attributes can get out of synch due to differnt user groups for wtpart or cad or just by user error.
A bi-directional synchonization for certain attributes would be a great enhancement to improve data quality.
Challenge is to break the circular reference when to publish from WTPart -> CAD -> WTPart but it is possible by some evaluation if update is really needed.