I'm a little confused looking at what games to buy at launch. When looking at watchdogs legions for example, the game states it is for xbox one x / xbox series x. Surely it should be one or the other? The series x game shouldn't run on the one x as well should it?
Xbox Smart Delivery.
Where the publisher opts in to the programme, the Xbox One, One X, Series S and Series X versions of the game are rolled in to a single purchase. Your console will download the appropriate version.
No more messing around with dodgy and inconsistent upgrade terms (with most publishers).