" Nope. Not design.
Proper installation of Daycos do not squeal."
As I've indicated in my previous post, proper installation of Dayco belts do squeal. I'm not saying you have not had good luck with them. What I am saying, however, is that you are being presumptuous claiming it is not a design issue because of your one example. What about the legions of Protg owners who still deal with this issue? Do you seriously believe that that many people don't know how to install and properly tension belts?
This is a well known and fairly widespread problem with these cars. Just do a quick search for belt squeal on any Mazda forum.