Welcome to real life then 
I can understand why some developers might not want to „commit to“ a statement they have done earlier.
And you must understand that some developers are a „one wo/man show“ and I guess the majority only very small teams. So „marketing“ is typically not a priority in the early days of development, and most developers might not even know whether an XBox version is even feasible (while certainly desirable, also by the devs).
So if your past experience shows that 95 percent of all products will eventually make it to XBox I suggest to „relax, and enjoy life“