Looking at this list it looks like Xbone still gets regular releases alongside current gen versions but there don’t appear to be as many compared to PS4/5, especially not for bigger name games but you still some of those occasionally. For instance, WWE 2k25 is getting an Xbone along with the Series version.
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Less demand, plus less support from Japanese publishers.
IIRC when the Marvel vs Capcom collection was announced and missing from Xbox entirely, the issue that was brought up was that Microsoft no longer accepted games to be submitted as purely Xbox One releases. You had to make a smart delivery package with both Xbox One and Series builds, even if the Xbox One build would run fine on Series.
I think an exception was granted for the collection.
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Apparently a major reason why it was last-gen only was because the engine Capcom used is not supported on PS5 or Series
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