Because they’re making Xbox Series games
(I was seriously thinking the new console was called “xbox one series S”)
I strongly believe that the One X should have been renamed to make it easier to drop support of the One S.
But that never really came to fruition. Unless you mean that they should still be supporting the One X further into this generation.
I think that the One S should be dropped first, followed by the One X, but that the One X shouldn’t be anchored to the 2013 console.
So yeah, the One S should be dropped and the One X should be supported further, then be the next to drop say 2 years after. As it exists, it appears that the One X is anchored to the One S.