No one in decent shape NEEDS O2 up there, if they take the time to acclimate. But compared to the number of people who try to skip the acclimatization process and get by with mega doses of aspirin, ginkgo, heavy breathing, superhydration, diamox etc, I'd say oxygen is a better idea. At least we KNOW it works.
RE: the crutches. I grew up in AK, and crutches up there are issued with flip down "crampons" for walking on ice.