My personal experience with it is as you stated. Then again, I am a 35-40 MPH rider typically and not balls out bomber so I am not personally experiencing anything that causes me lack confidence in its controlability on hard pack. When it is actually ice, I slow down A LOT because at 48, I am not willing to take the chance of slamming hard at high speed on ice so there again, I am not feeling any issue.
I think pretty much everyone agrees that for flat out bombing on ice, a full camber deck is always going to be a little more sure footed. I know I tend to break ot the full camber stick when all I have to ride is icy groomers because off piste is a total shit show.
I'm not a balls out bomber either but I do get those days where If the conditions are right ill bomb a run or two! 35-40 is about where I'm at most of the time as well. Ice is a whole different story I slow down a lot as well. But I do more of my riding out west and have a shorter board for local riding ice crap anyway!