A short intro on what Biome is would be helpful - specifically here in a more general community, but also typically in release notes.
Quoting the home landing page:
Biome is a fast formatter for JavaScript, TypeScript, JSX, TSX, JSON, CSS and GraphQL that scores 97% compatibility with Prettier, saving CI and developer time.
Arguably, the openness is in that the EU OS can switch from one to another at some point if it becomes necessary.
Supporting multiple alternatives within the same platform and OS is costly. Not only the integration, but also user training and troubleshooting, specifically about the many, big and small subtle differences. Focusing on one, for now anyway, makes sense.