Yeah, I'm not quite sure what they were thinking. Not all DCTs are as bad as the DPS6, but the ones that don't suck are almost exclusively wet and not dry. A wet DCT isn't much (if any) more efficient than a modern hydraulic automatic on account of the fluid drag in the DCT and more gear ratios in the auto. They may be simpler and cheaper, but they're heavier and differences in performance are negligible in the vast majority of situations.Sticking the same trans that's in their other cars into the focus makes it easier and cheaper for the supply chain, plus something that's proven more reliable in the long run.
I would have loved for the DPS6 to have been a success, but the truth is that it was probably doomed from the beginning. It wasn't especially innovative, so there wasn't any industry-changing potential there. Simply put, there isn't any compelling reason to go with a DCT - wet or dry, DSG or DPS6 - over a slushbox in the overwhelming majority of situations (in a car, anyway). Traditional manual or a modern auto will do what 99% of consumers want.