My wife drives a P3 and I drive the Gravity.
It is certainly apples to oranges - they are different cars for different purposes at very different prices.
We love the P3 (came from a Model Y Perf) for its ride, handling, quiet and interior finishes and design. We have the 22" wheels, which give it the "Hotwheels" look. Bad software experience until *BANG* they fixed it with an OTA and it's been fine since. I'm not a fan of the interface, but I like the car. We're looking at an iX3 for the replacement next year.
The Gravity is my daily. We all know the software and hardware issues, many of which I have been spared from. One of the things we notice when we get in the P3 after driving the Gravity is how noisy the P3 is. Wait - noisy compared to the Gravity! The P3 was our standard for silence on the road, until we got the Gravity. P3 sounds like a window is open (actually, it is probably mirrors and trim causing wind noise that Lucid has managed to minimize) compared to the Gravity. I smile every day I walk up to or drive the Gravity. Light years ahead of anything else on the road, IMHO. Others will catch up and the Neue Klasse iX7 will undoubtedly be quite a car, but unless they make a third row that is usable and provide a real frunk, Gravity will continue to blow them out of the water. I keep my electric cooler in the frunk, alongside my HPD track bag. Keeps the space behind the third row clear for the everyday.
Dream ahead!