yeah sure like sastrugi, or just plain ice. A swallow tail will not give you more stability during high speeds. A swallow tail makes it easier to turn in deep snow, since there is less surface area.
If you are in, or trying to traverse, a 'no fall' zone you will want to have a stiff board with great edgehold. I don't know about the notch, but softish powder boards are not what you want.
btw an airbag will not protect you from rocks
Would the Rome Notch be too much for 30cm -50cm powder
Then what element provides the stability during high speed? Higher stiffness? Longer boards?
The swallow tail is more more speed? or easier turns in chest deep powder?
a stiff board with great edgehold, for instance?? Burton fish? Burton family tree cheetah?
btw whats Nug Raduction that lets you downsize the board?