> probably a 400V architecture, which is becoming outdated as 800V architectures and chargers exist now.

Good luck getting 800V mode to kick on half of the time if you ask most US drivers of 800V architecture EV's. Most of the networks I see with 800V capabilities are also the most expensive per KW of electricity by 10-20 cents a KW.

I'd much rather stick to 400V platforms for the next decade before we get serious expansion of modern charging networks in the US.

Many 800V vehicles have a split pack that can charge in parallel at 400V or series at 800V so they don't charge extremely slowly at 400V. Those are fine.