The Xbox One X is a powerful enough machine, albeit one that we haven’t had the chance to see unrestrained- this is for multiple reasons.
It’s that second factor more than anything else that leads to many wondering whether Xbox One X’s true potential will ever be on display.
Building games that support both XB1 and XB1 X is just an extension of that.”
The biggest problem is that Microsoft makes minimal exclusive titles any more (and those that it does are shared with PC anyway), while another reason is that it has mandated that all games must also run on a standard Xbox One alongside Xbox One X- which means even third party games are, in theory, held back.