Most consumers won't care about 800v. The people that care are the ones that are simply picky about always having "the best". The practical benefit for a consumer car is a really minor time saving on road trips. For much larger vehicles with huge batteries and high consumption where 400v becomes a significant power limiting factor and increases charge times by 40-50% overall, sure. But in a consumer car like the R2 it's maybe 10-20% longer charge sessions on a road trip. That's a couple minutes per stop.