You can get to 24kW charging with single phase NACS, which is where the vast majority of EVs' on-board rectifiers max out at. Many max out lower than that.

If you need charging above that, especially at fleet level, it is cheaper to go with dedicated DC charging like the one's I linked. 48A single phase charging is more than enough for the vast majority of all EV use-cases, even for fleet vehicles. Amazon has the largest EV fleet fielded right now, and that's in the US.

You're complaining about a non-issue. Three phase AC EV charging is a solution in search of a problem.