Yeah it's undeniably cool for GamePass subscribers who are paying enough attention to see it. It's wonderful to get a happy surprise like that. But it's going to be on fewer people's radar as a result.
Look at how High on Life shot up the charts despite much more divided reviews, a similar length, and twice the price.
Marketing and development costs tend to scale appropriately in Xbox division. I'd be willing to wager that a disproportionate % of the cost of this title was in licensing the music, and by the sound of the selections I've heard thus far, they probably didn't break the bank, if you catch my drift.
Look at Pentiment. Had Starfield not been delayed, that game was probably penciled in as a shadow drop for The Game Awards instead of the sole 2022 1st party game announcement for the year at their "not E3" presentation. Would explain why they showed up empty handed, despite those two dates only being three weeks apart. They could've announced Hi-Fi at TGA, but the game wasn't ready for a shadow drop scenario.
You can question the logic in not showing a trailer at TGA and releasing now vs. the shadow drop strategy, but that's arm chair game publishing and feeding into typically toxic game forum logic, IMO. There is a legitimate argument on both sides for the way Xbox are handling every aspect of their division, but dissecting their marketing strats seems like small peanuts vs. their studio struggles.
High on Life was a pretty high profile release, pardon the pun, because it cost Microsoft a LOT of money to procure exclusivity, AND because it is a good game with a huge potential for bolstering their service, made by a pop culture icon that is, sadly, currently being publicly flayed.