What makes it seem convoluted? It's slightly more complex than a standard electric stove, but we have and use countless devices on a daily basis with this technology. Very rarely do they have any issues with the charging/discharge circuit.

Yes, the batteries will eventually need to be replaced, and it could be an issue during Thanksgiving (etc) when a ton of power is needed all at once. But I really think you're overestimating the usage it will get.

In any event, this is why they're running it as a pilot. Any real-world issues will come to light before a larger rollout.