It's a good question!
What benefit do you think that would bring? :-)
Because the complication of more hardware (and some other things) brings a lot of downsides and risk too,
They are separate devices.
With the wind sounds being what they are.. if you can see it, you can't hear it and if you can hear it, you can't see it.
Audibles go inside your helmet; visuals go on your arm :-)
They are also semi-backups to each other.