I agree, although I wouldn't be surprised if that information wasn't already being sent back to Tesla in more or less real time so the only issue might be getting the information back to the car.
Not even. All cars running 6.x have access to real time data:
Model S will now automatically navigate you to your destination by integrating the best charging options into your route. As with Range Assurance, your car looks up the charging locations in realtime, so it always has the most updated list and queries the Tesla Superchargers to determine their status. Essentially, it is a big network of cars communicating dynamically with a big network of chargers.
The capability is poorly leveraged, IMO.