To me this is a question that many people have very different views on. I see people out ridng backcountry with just their dog, snowmobiling by themselves, solo climbing.... They all have the same drive as an inward challenge, but have a different level of danger (ya know, none of those are dangerous otherwise!!) On the other hand, they won't pull their buddy into a more dangerous situation if things go wrong.
My bros & I were just talking about this the other day, and our take was that if we're buried or pinned, we want somebody diggin for us!