Transmission break-in. Made this experience with Mercedes. (Company car one year lease, Same model, same transmission (only 7G-DCT) - totally different outcome on the two).
First one was delivered fresh from the factory via driver (300miles) and i had to drive to a project the same day(400miles).
If i had paid with my own money on the first one i would have been in the shop ever week. Drove like a beauty on highways.
But shifting in the city was hideous (same symptoms as mentioned above) and wouldn’t change/improve for the next 30Kmiles.(reset/early fluid change included)
Second one i picked up myself, broke it in correctly. No problems.
What you do wrong during the first 1000 miles on these modern transmissions is almost impossible to be reversed. Even with resetting/reprogramming. Best chance is the driver does another prolonged and very meticulous break in cycle as early as possible.
Because any reprogramming cannot be fitted to the individual abrasion processes during the break-in.
The mentioned alternative in the article (a Kia) has pretty basic 8 speed AT vs. the Ford’s 10 gear triple clutch transmission. Go figure.