The Ioniq5/EV6 adapter only plugs into the J1772 port. This is not how the F-150 works for V2H. The F-150 hooks into the CCS pins underneath the J1772 plug, and mostly likely uses the same digital signaling used for CCS, instead of the PWM signaling used for J1772.
Either way, the resistor across the PP/PE pins is mostly not for current capacity of the EVSE, but rather just the cable (which isn't normally an issue, as the cable is going to be rated as high or higher than the EVSE, and generally isn't detachable for J1772). This is relevant only insofar as the Type 2 connector in EU (etc.) use the same technology (including signaling).
Generally speaking, I'd expect CCS connectors to rely on an off-board inverter, as they can be built in a less weight conscious manner.
That's interesting that the Kia/Hyundai system uses J1772. I guess that means the output current is AC? Maybe easier to work with, in terms of wiring to the mains?
Either way, the resistor across the PP/PE pins is mostly not for current capacity of the EVSE, but rather just the cable (which isn't normally an issue, as the cable is going to be rated as high or higher than the EVSE, and generally isn't detachable for J1772). This is relevant only insofar as the Type 2 connector in EU (etc.) use the same technology (including signaling).
Generally speaking, I'd expect CCS connectors to rely on an off-board inverter, as they can be built in a less weight conscious manner.