I would tend to believe that Triumph ordered the rotors or materials to be made in good faith, and that the supplier had issues in the manufacturing process.
My 05 Speedmaster rotors are a might warped at 20,000 miles. I still remember the drop anchor event that caused it. I've lived with it as the dealer is so far away, and I never wanted that much down time for a warranty go 'round. Chalk it up to my lack of interest in the issue, or what have you. I'll probably up and go aftermarket from Brent when I get around to it one of these days. He is about offering quality goods, and IMO wouldn't sell something if it wasn't up to snuff. Last I knew, as a fellow Triumph rider, he uses and depends upon his own goods too.