Higher voltages and liquid cooled cables permit higher power levels without making the cables and connectors unreasonably large and heavy. You can see this in T

Higher voltages and liquid cooled cables permit higher power levels without making the cables and connectors unreasonably large and heavy. You can see this in Tesla's "V3" supercharger, where they increased the power to 250 kW, but actually made the cables thinner by adding liquid cooling. Of course, high voltages do brings other issues, like risk of arcing, that need to be mitigated.