This is correct. I was looking at having a Tesla and a J1772 power sharing (replacing a 3 with a Rivian in 202x) but right now it’s not possible. I can’t imagine why this is better from a manufacturing perspective.None of that is true. The J1772 wall connectors are based on a Gen2. They were built long before the Gen3 was ever created. Tesla just didn't sell them to the public before now. It has no wi-fi connectivity, so it obviously can't communicate with Gen3 wall connectors. It only has the twisted pair direct wiring for sharing, and it can only share specifically with other Gen2 type units that have the 50A limit, of which two types are available: this J1772 kind or the older ones that came with a 14-50 cord attached, but those are kind of rare.
Yes, you are correct. It can't share with Gen3 ones at all.
One would think power-sharing will be very common in households at the front of ev adoption, and Tesla doing a first move for those use cases and the valuable data it generates seems like a no brainer. When x% of the grid energy will go to EVs, having telemetry at the instance level would be gold for things like autobidder. (note, I don’t believe they do any of this or have TOU that allow to do any of this right now)