I think there is a middle ground here - series S should continue to be supported by MS with game parity. But I feel like there should be more flexibility when it comes to feature parity. In the Baldurs Gate scenario MS should have allowed the game to ship on series S with no co-op from the start. While you might say that this sets a bad precedent, MS can get around this by forcing developers to apply to them to have features skipped - which they can decline obviously. A bit more admin but you will never have a scenario where a massive IP skips Xbox.