I do not want a component maker to ship a component with an expensive cord and charge me for it! No, thank you!
I will select the cord which matches best and is complementary to my rig. It would be a mistake for these companies to supply a cord which may sound good on their voicing system(s) but may not in fact be a fantastic cord.
Component makers without expertise in cabling should do exactly as they are, supplying a basic cord. Of course, this doesn't give anywhere near the performance potential of the component, but it's a lot better than leaving selection of power cables up to people who have no idea what your rig is and what sounds good to you! If component makers supplied high end cables, depending upon the cables that could actually be a negative, paying for a device which would hinder performance.
And, yes, some component designers/manufacturers are clueless about cabling. :(