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they're limited by a 4G connection

Are they?

- they could store data to be collected in bulk when the car is in the garage for maintenance or servicing or repair.

- Superchargers could include fast data transfer in their cable for cars using them.

- Superchargers could include a wireless data collection from cars sopped at or near them.

- Cars could connect to public wifi to upload data at any car park, any place, any time.

- Tesla could have vehicles driving around, like Google mapping cars, collecting data wirelessly from nearby Teslas.

I don't know if they do any of them, but none are unreasonable things for companies of 2019 to think about doing.