I've had several successful charges at 320+ kW sites, it's just that there are (around here) so many small sites that are clogged with slow-charging vehicles. At least with Tesla, there are 8-24 stalls at each site so I'm not waiting 30 minutes to charge.
We had some mixed experiences today. I stopped by a non-busy Circuit Electrique today and got 320kW sustained for a while:
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Later we stopped by a Rivian Adventure Network site, which was very awkward in terms of cable length and location, and didn't work. It might have been a timing issue, but we went back to the EA site that was full instead of trying to debug. The EA site was 4 "balanced" 350 kW chargers, and on a shared post we couldn't get more than 115 kW. Once we moved to a non-shared charger we burst to 325kW for a while. With overly congested tiny sites and power sharing, all of these non-Tesla sites are just not a good experience. I hope this gets better. (Unfortunately the Tesla Supercharger in the same locale is mixed V2+V3 and so not open to NACS partners.)
Also, as mentioned above, the Lucid app data on all these stations was correct, but the in-vehicle nav had wrong charge-rate data and listed the unavailable Tesla. It's bizarre to me that the app and the car pull from different data sources here.