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FYI, I’m in an SC waiting for a repair, and I asked about getting my Nav maps updated to reflect the new SR-99 tunnel in Seattle. I was told that the map updates are done at the SC’s only and not over the air as in the past. First I’ve heard this.
With Tesla trying to reduce Service Center visits by reducing the recommended maintenance and using more mobile service vehicles - it makes no sense that they would require a Service Center visit for a software or map update.
Requiring WiFi makes sense - but not all owners have access to WiFi.
I think you were given incorrect information. Two of our four Teslas recently had their maps updated via wifi. The other two Teslas are still on maps from 2018 but their maps were updated at least twice in 2018.