That's rather odd. In at least my 2017 330i and I'm pretty sure my 2015 328i the navigation software updated automatically over the air. I don't think it did it in my 2013 320i.
I would be driving and it would ask me if it was ok to restart the system to apply the updates. Have you checked or waited to see if it updates over the air?
I didn't find the voice input too bad but the manual input was indeed rather brutal.
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