Ruben Van de Voorde digs into data apps:
Fabric data apps are the most interesting thing to happen to data visualization in Power BI and Microsoft Fabric, ever. They provide limitless potential for how to visualize and interact with your data. However, they also indirectly provide a major benefit to your semantic models by allowing them to be simpler to build, use, and maintain.
In this article, we argue that data apps provide a reporting layer that is separate from the semantic layer, something that wasn’t true in Power BI due to tight coupling between reports and semantic models.
Click through to see where they fit vis-a-vis Power BI reports and semantic models.