Okay that was a typo. Should have read: "In hazy and poor VMC it's wise to NOT fly below MSA. This airspace suggests getting a clearance from ATC so that you safely avoid terrain and obstacles."
and why many of us who use it are glad of its existence?
Sure - We have similar corridors over here too. In the event that clearance is not immediately available then this is a fuel saving shortcut. But it's never my preferred route for all the reasons I mentioned earlier. That's all I'm saying.