I don't have any experience but I did notice on larger overseas messageboards the reason given for not rebuilding is that doing so wouldn't restore the patient's ability to talk and eat, either because of the amount which had to be removed or the location. That said, the only people who can answer why rebuilding isn't being considered in your partner's case are his treating doctors. It's definitely something you should ask them and they really should have explained why without having to be asked.
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