If 'theme' were the judging criteria, perhaps you'd have a point. However,a good part of the judging criteria is the technical elements. Scott and Tessa's program was technically very difficult (lots of deep edges, and turns, very few crosscuts, almost no side-by-side skating with lots of partner holds). Scott and Tessa won the FD on the technical mark. Also, your note they they were "slower" has more to do with the fact that D/W's music was faster so they had to have faster steps to it. Thhis is just my opinion, but at times I felt it was riding the edge of control and that they were almost going for it a little too much. As for the skating, V/M carried a lot of flow through difficult footwork. That kind of speed (flow) is a far more important quality to an ice dance.
Well, not that V&M are not deserving, but V&M's FD technical score according to the protocols was only .30 higher than Davis & White so to say they "won" on the Technical Score is somewhat exaggerated in regard to technical difficulty. They won primarily on the Program Component score which was 57.32 vs 55.39 of Davis & White and of course D&W had a 1 pt deduction for an extended lift. V&M and D&W are both excellent teams with totally different styles. Some like one style better than the other and that's just as subjective as the Program Component scores.