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It's important to know that those 350 kW will only be reached with battery voltages of 800V or higher. Same as i.e. the Tesla Superchargers, the CCS plugs are current limited. Depending on the manufacturer and source they currently talk about 200-300A of current. So on 400V, they will no be able to deliver more than Tesla already does.

And most importantly, as you already noted, the cars capable of actually taking that much power are still to be announced ;-)

As I understand it they had developed a product, found it didn't work on
enough of the stations tested that it would be frustrating and expensive
to sell and support.  At the time.  For the sample of stations available at
the time.

But I don't really know the whole story, that's just what I pieced together.

Yes, I know, not a conspiracy, but you know, you set it up with an East Coast
West Coast kind of comment.

Workaround to the 200v minimum would be, if you have a AC charger that
also works on DC, to run it through that.

In other words, tell the station that you require within the range they can do that
overlaps what the charger can handle, say, 240VDC and use that to run the charger
at a rate limited to what it can do and what your battery can handle.

For example, I'd expect that my diginow SCv2 9.9kw system would (if compatible
with DC, which I have yet to test), be able to take 240VDC to charge my battery at
1C, i.e. 9.9kw, up to 116.5VDC.

So if that's true, then the missing piece is the signalling to tell the station that a vehicle
is present, and that the vehicle is ready to charge at 240VDC.

And the inlet itself.