FWIW, I finally had a chance to drive a GT in Germany and it was easy to compare the noise levels with the BMW IX.
First off, BMW does a great job insulating their cars. I noticed the Lucid having a pronounced motor whine at low speeds while the BMW is silent. Both cars have similar window seals and frameless window designs.
Besides the whine, the Lucid was still a quiet car. We drove the car on the Autobahn for an extended period of time, mostly at 120-130mph but also quite a bit at 150-170mph (top speed is a touch above 270km/h). Car is super stable, very controllable at speed. Car had the 21" wheels with Pirellis. A fun car to drive.
I should mention that the German cars have no demo mode all offer the full power sprint mode.
Then we drove the BMW to its top speed, which is limited to 125mph (200km/h).
When it came to wind noise, there was a light wind noise on the Lucid drivers front door but it was neither intrusive or bothersome. The BMW was initially quieter but the wind noise (and tire noise - 20" Goodyear EV tires) became significantly louder at speed about equal at 80 miles and much worse over 100mph.
The Lucid was the quieter car to drive at speed and the whine only noticeable at city driving. It's a bit annoying but easy to ignore. The Lucid rep mentions that this is a common comment but then most Germans drive Diesels which are much louder anyways.
I like the software layout/design but recognize that it's pretty rough vs the BMW iDrive software.BMW also uses better system sounds than Lucid. I could appreciate a quieter turn signal or if not, at least a better sound clip.
Couple other items:
The center screen was laggy and the rep did a software reboot. I thought I had read of a different method but the way he did it was by turning on the left turn light, exit the car and lock it with the card. The software was reset once the turn light turned off. Nothing else.
The speed limit recognition sucks vs other German cars. It often read conditional speed limits as the one to use (during night or rain) or doesn't update as needed. This can cause speeding tickets or issues with other drivers.
Overall I find the car a compelling performance car that will improve with every software update. In regards to the wind noise, we have had plenty of cars that have the same issue (BMW, Mercedes) and if a future seal replacement will fix this I wouldn't fret it. A Mercedes dealer will tell you that it's normal