You are right on AC charging that used on-board charger that convert AC to DC. 11kW or lower are all AC. 22kW have both AC and DC variant. Those faster charger eg:. 150kW are all DC.
The DC fast charging don't use on-board charger in the car, it is the car that negotiate max supported charging rate with the charging terminal directly. So that case the limit is not the on-board charger, but the battery type, battery array design, and thermal management.

So far the commercially available mass market EV with 800V are all those have stake in Rimac group. The one that build Rimac Nevera 2000hp+ Hyper EV.
Lotus hyper EV also run 800V, again that's hypercar, not for mass market.

Basically Hyundai Group (Hyundai, Kia, Genesis), Porsche Group (Porsche, VW, Audi) are the 2 mass market brands that have access to mature commercially ready 800V technology.

So 800V are still very uncommon. Even we have 800V charger, very few EV can make use of that. But expect more and more to move to 800V in the future.

I wont go into EV if there isin't a charging station every 5km in KV and every 50km on highways...

And before anybody start sharing the battery swapping technology. My take is that it's not gonna to work anytime soon. As magical as it sounds, it really doesnt make sense.

1. it is extremely expensive to build a battery swapping station, and it's useful service range is probably 10km radius, anything more than 10km is not practical for owner to use
2. extending from #1, it will take super long to get ROI on swapping station, and slow to build more station, especially so for smaller city and town
3. car owner are offered a battery subscription model. So they can actually buy car without battery, then they subscribe to the battery and pay monthly. During subscription, they can go battery swapping station to swap their battery. But subscribing to this is way more expensive than using petrol
4. There's no guarantee that all stations will work, some break down, then what happen?

It will only be feasible if China manage to unify all battery standard, size, and placement in all EV cars, so it's feasible for them to build battery swapping station as part of their infrastructure. But again, all cars are design and build differently, it's hard to imagine everybody building the battery in the same way. Even within the same company, for different car model, size, body, are they able to ensure their battery size and placement is all standardize? Hard also.