I've done some mountaineering. The people going down would have known the risks and accepted them for an opportunity for a once in a lifetime opportunity to go to the titanic.
Whilst in retrospect, things like this seem like a stupid risk, sometimes, you become so focused on wanting to do something that you take them.
Personally, the idea of being stuck in a tin can with thousands of pounds of pressure surrounding me with absolutely no redundancy/backup though isn't my kind of thing (same reason I take a rescue beacon when hiking, i always want some kind of backup. Even on Everest, they have some backup). But, too each their own.
Sometimes in life, you need to take a risk.. Also, I'd be more worried if they were using Switch Joycons