Thank you for the data.
Automotive published dimensions are typically of the body excluding the side mirrors. I think the Lucid mirrors are larger than BMW's due to the integrated cameras and the pointed outer edge. I believe the overall width including mirrors is a bit more more than 2 inches greater.
My perception of size is clearly wrong when it comes to length. I suppose the bathtub effect of sitting 2-3 inches lower in the Lucid has something to do with it. The Lucid Air is about 5,200 lbs. and the BMW 530xi is something like 3,900. That could perhaps factor into perception as well.
I agree the BMW I7 is hideously long, and, well, just plain hideous.
Cheers.