I think Rivian, being an American manufacturer, is probably basing their offerings on the American market first. And there, there seems to be very little demand for sedans, outside of wherever they are the cheapest option available.
I wish it were otherwise, but that seems to be the way the market is going.
It just keeps going; from almost a dozen Trackmania accounts, to forum posts, to YouTube comments. A lot to follow to keep it all straight. I feel like I need a spreadsheet to watch this video.