Layout Builder
Structured content can be confusing for content authors. Ensuring that Drupal promotes usability and ease of use for content authors helps ensure a Drupal application can be adopted. Authors often struggle to understand how specific fields map to different, rendered visual presentations. Layout Builder attempts to provide a visual experience for content authors to see content change. This combined experience helps the author more directly and easily see how a change is displayed when the change is made.
Layout Builder stays with a layout. Think of this as a series of places on a page where the content can be rendered. From the perspective of structured content, each field in a node can be placed within the layout. Blocks rendered on a page can also be placed within a layout. This allows Layout Builder to author content beyond just the structured content on a page and from the experience of what is rendered, not just the underlying fields.
Placement has context...