Pradeep Srikakolapu makes an announcement:
Microsoft Fabric is officially sunsetting Default Semantic Models. This change is part of our ongoing efforts to simplify and improve the manageability, deployment, and governance of Fabric items such as warehouse, lakehouse, SQL database, and mirrored databases.
This is definitely a good thing. The idea of a default semantic model wasn’t bad, especially early on in Microsoft Fabric’s development life. But those default models almost never had enough information to do what customers actually want, so they would sit there as a distraction.