Hard to say. Perhaps there is a protection to maintain battery health in the long run. Other EV brands are relatively young in this domain, so there is nothing to say yet about their long term battery health. The charging speeds/curves are impressive with other brands, but I am wondering how the degradation curve will goe during the next couple of years.Why do you think other EV makers will be any better? I am just being devil's advocate.
All we can say for sure is that on our X-es, it should be better. Also in Europe, where we cannot even charge over 140kW due to the adapter (so we are missing 60kW anyway).
Coming from a Model 3 long range (and not looking at the 250kW peak) the performance was better. High power charging until 65%. Possibly due to other chemistry in the Model 3 packs.
I do indeed think this is a software cap, but with best intentions from Tesla to protect our packs.