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It is useful to have ability to make the UML project from a java project by Reverse Engineering and do not have source-model synchronization between the projects. So you could rearrange elements in the UML Model without any risky to change/break java code.
It is the current behavior now. The recent feedbacks from posts seem to indicate that most users prefer better control to turn on/off the synchronization to disabling the feature completely.
Swoitching from "feature" to "enhancement". We use feature for release planning.