If you've seen a lot of Phil Spencer news lately, it's because he's doing a media circuit—taking interviews and giving statements to drum up support for Microsoft Gaming.
In this latest round, he spoke about video game expansions - policies, general dos-and-don'ts, and his own thoughts. To that end, Spencer gave us some insight into what he generally likes to see.
This is the sort of thing that's hard to pin down as a policy, and as such, Microsoft specified that there's "no general mandate" that it is enforcing on game developers.
Getting into the specifics, Spencer cited the latest Starfield expansion and a discussion he had with Todd Howard about what should and shouldn't be behind a paywall.
One piece of feedback Spencer heard about the expansion was a lack of new features. He and Howard found a potential solution, but didn't seem to like it much.
That game's buggies came out before the Shattered Space expansion dropped, and as such were free to all. Holding back the buggies would have, in his mind, helped solve that problem - but it would've come at the cost of Spencer's apparent position on what an expansion should be.