I don't know what requirements they are referencing, but the SAE standards are defined after well after touchscreens. (I believe touchscreens date back to the 1

I don't know what requirements they are referencing, but the SAE standards are defined after well after touchscreens. (I believe touchscreens date back to the 1980s). But I think that is a somewhat unimportant point because the requirement intent is to make sure the warning is conspicuous. I'm not sure that touchscreens would be inherently different in that regard. Or are you thinking there's something unique to the touchscreens that makes them meet that intent in some other way?