OK. Devil's advocate mode...ENGAGE!
In South America where I was born, it rained 170 inches a year. it was common to see skinnies on Jeeps, because they cut past the rain-soaked top-mud...and dug into the hard clay just beneath...resulting in better traction that would be missed by wides that tended to slid around on the muddy top...
They can be helpful in slushy snow over pavement for the same reason...or mud over bedrock too.
Personally, I'd rather have wide for floating over soft sand or powdery snow or hard-pack...but I don't think skinnies are "bad" so long as they fit these kinds of unique needs. i do think that MOST of us likely benefit from wider though...
My 1.5 cents...
Markuson