A couple of years ago a mate of mine told me that Ford have 50, 100 and 200 year strategies....
The end goal is to find a design (or a few) that appeals to the majority of the buyers, and make variants for function and size. But the majority of parts would be pretty common, because they maximize profits.
High volume parts = more profit. He told me that ford actually only makes about $60 profit on each car that leaves the factory, the rest comes from aftercare/spares/servicing.
Looks like SEAT have beaten Ford to the finish line with a common design, the question is, will the range appeal to enough people ??