If your ioniq is anything like my old Niro, you actually have 2 condensers, and it can pull both heat and a from the heat pump at the same time.
That also means if you have a leak in one, you lose both. That’s how I found out about the setup.
I haven’t looked to see how the ev6 or ioniq 5 are configured though, but I’d expect it was the same as the niro
I could see it being useful for traffic jams, stop and go traffic, and rush hour. EVs would passively gain range in those situations. As a matter of maintaining battery while driving at any sort of real travel speeds? Not worth it.