I don't see how I contradict myself, and since you speak of splitting hairs it sounds like that there's not much justification for your statement. So you can leave it be if you like; I don't need an explanation. As to barefoot outer space exploration, assuming outer space is extremely cold, then the first condition I mentioned regarding the necessity of footwear would certainly apply.
I have to disagree with bfrank that hot asphalt is an absolute condition for shoes. I walk on it every summer without discomfort. But seohsreven's list made me LOL for those are truly ridiculous things to be doing barefoot! But heck, if there are people out there who want to make a sport out of ridiculous activities, then more power to them!
Sub-freezing barefooting isn't bad at all. Just know your limits so you stay healthy. temps in the 20s are fine when your circulation is good. Even lower for short periods. As long as you enjoy it. Extreme barefooting ? any events in mind ?
Phew! I'm glad that someone got the humor there! Some here don't find them as quite as ludicrous as we do...
Actually that's not exactly what I said. I walk on hot asphalt every summer as well. My feet are pretty tough and used to it. What I said was "Extreme temperature...so hot that feet would be burned." Asphalt that hot was just an example of something that could reach temperatures extreme enough to cause damage. Asphalt could easily be quite hot, but not necessarily hot enough to actually burn skin. On the other hand, I'm not sure where you live, but in Southern California wide open expanses of asphalt can get extremely and dangerously hot as the summer sun bakes down. I've experienced the same conditions in Key West, Florida on visits there as well. Same with the sub-freezing conditions comment. I've walked around barefoot in sub-freezing conditions as well. It's all a matter of how "sub" the sub-freezing is and how long feet are exposed to it.
Speaking of barefoot jobs, i like sailing ships (square riggers) and did several voyages on the barkendeavour (a replica of captain Cooks ship) as voyage crew. Most of the permanent crew were barefoot all the time, and i went barefoot myself much of the time, but found i had to wear shoes when working aloft, standing on a rope while hauling in a big heavy sail. Apparently, this requires a different kind of foot hardness to that which lets me run on gravel...