aye definately common sense response, standard "working as intended" email.
I think peoples root concern is not that the part won't get fixed or will it fall under warrenty. Its disruption of having a broken car, time and money lost etc etc. Even with a loaner its a pain. Also could the broken part lead to other broken parts, or prematurely compromise another part to break.
Then, after its fixed whos to say the new part isn't the same type part that had failed the first time and will eventually fail again at some point, and repeat the ordeal.