Clearing the value is the right thing to do, and was what was originally done with SDs. See following topics (they are very long but first post of first topic summarizes my points very well):
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Deletion of SD objects, where I didn’t convince Maidsafe.
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Transparency or opacity of SD modifications, where I did convince them and they put back an SD implementation with this principle.
Later, this post was a confirmation that this principle would also be kept with MDs.
So, they have changed their mind again, but I won’t debate a third time because this is too exhausting and I have said everything I could on the subject in these 2 topics.