Let's not forget, the R2 is a mass-market targeted vehicle. If you normalize the R2's charging curve vs Air and Gravity, I'd think (I haven't done the work yet) Gravity would be best, but R2 beats the Air (in charging curve). My take is, R2 stayed with 400V for cost reasons. Most mid-size buyers care about how fast it charges (miles gain per min), how long to get to 70%) but not the voltage.
In terms of EV penetration (of the vehicle market), China is beating the US hands down. The short-sighted oil-centric US policies has seriously compromised the US-EV position. Until now, for all intents and purposes, Lucid's only real market is the US.
The Europeans embrace EVs much more than the US. In China, it is a national quest.
Let's not forget that Tesla (Musk) and Warren Buffet (BYD) were key players in the early days of China EVs.