Xbox series x possibly broken

the whole family from 2001

Xbox

Xbox 360

Xbox One

Xbox One S

Xbox One X

Then soon Xbox Series X and possibly Xbox Series S

I was under the understanding that when you download an Xbox series x game it has different code, so it wouldn't be possible on xbox one x. Which would also be the same for the hard drive. The xbox series x game is apparently different than the same game
for the series x.

if the rumour has any truth to it, it will be an Xbox exclusive (Xbox One and Series X and possibly 360) as there has already been a press release stating that there wont be any games exclusive to Series X.

I would presume that if a game is Xbox One X Enhanced, those benefits will also appear when the game is played on Xbox Series X, along with any Optimized for Xbox Series X benefits that same game might receive through future updates. I doubt seriously it
would be a step backward when played on the superior hardware.

Keep in mind the Smart Delivery feature, which will enable Xbox Live to send the best possible version of the game to Xbox Series X automatically. So that may be the Xbox One X Enhanced version, or (if the developer makes such an update possible) the Optimized
for Xbox Series X version. Given the choice, I'd want the Optimized version.

That's why its just called Xbox... and the other series or models will be called series x and possibly other series code values yet to be determined officially