How so ? We've had cross generation games in the past that ran on vastly different hardware sets. The year the XO and PS4 hit there was still a similar looking COD on X360 and PS3 . I think it would be much easier to put a game on The XBX and PS5 (Esp if PS5 is 2020/2021) then it was to put a game on XO and PS4 and target the x360 and ps3 .
I agree, but my point concerned the XB1/XBX. Unless a game is purely GPU limited, the X should not be a more viable option than the XB1 for next gen games...