I'm glad you get it!

Too many factors are involved for one to just simply look at some numbers and go "oh, that's the perfect solution for everyone!".  Climate and work load as you mention are definitely important things to consider, but so are race/ethnic background or where we grew up, etc., and I'm sure there's more.  But I know the poster meant well and although I found the info hard to understand, I'm sure some of it is useful at least for some.