Not all new cars have ice warnings, my last 2 Mercedes’ haven’t and I’d prefer it if they did. They do show the outside temperature on one of the screens but it’s not shown all of the time (unlike the speed in kph - who needs that!).
As an example, when I left home yesterday the temperature was 5C, it wasn’t icy, as I drove to Brighton the temperature dropped down to 0C, there wasn’t any indication it got colder without looking at the temperature indicator - I could not feel it in my nice warm car, the road didn’t look any different, but at 0C the damp looking patch could be black ice rather than just being damp. I suspect that’s what happened on the bridge in the video, but by the time you realise it’s too late to do anything about it.
I get it that you shouldn’t need fancy electronics to be aware of the conditions but it’s a driver aid, design to help make better decisions quicker - no different to the blind spot indicator you see on wing mirrors now - do I need them? No, but would I miss them if they weren’t there? Yes.