Howdy,
As one formerly in charge of warranty, and for two different manufacturer's, allow me to assure you that no manufacturer wants a defective product out there. By that I mean a truely materials or workmanship defective unit.
The problems occur because a lot people, including marketing departments, abuse warranty. Warranty means a written document assurance (a Warrant). It means no more or no less than what it says on the paper.
Those policies that replace any complaint merchandise on submittion are marketing guarantee's, not warranty. These are following the highly cynical marketing theory, that so few will be returned that it will be an insignificant percentage of sales, and can be budgeted accordingly!
Warranty can also be abused as a sales tool. Again this is following some highly cynical numbers game.
warranty and guarantees are just like product liability, we all pay for it in the long run through higher prices charged for the goods sold. That's what society expects, and that is what we get.
Regards,
Walt Galer