Having just today run upon this deprecation I can say that moving Occurrences between Topics or *deliberately* orphaning them during an editing operation are things that I've been doing for years. This is an application-level responsibility, not something to be constrained by the engine.
Arguments based on Topic Map theory (i.e., what "should/should not" or "may/may not" happen) are not...
2009-06-19 04:55:43 UTC in TM4J