I can’t believe people cared enough to downvote this. People are more comfortable with what they grew up with, what a novel idea. No no, the only system that makes sense is the one that puts 0 at too cold to be comfortable (for some people) and 100 to too warm to be comfortable (for some people). So let me ask this instead. Why 0 to 100? Why not 0 to 144? Why not 0 to 180? Why not 0 to 90? These all have their value, and would have been preferred in various cultures, because that’s what was familiar to them. The range is no less (or more) arbitrary than the markers used to divide it.