How does dynamic metadata in HDR10+ improve upon this?

HDR10+ uses dynamic metadata to deliver scene-by-scene or frame-by-frame instructions for brightness, contrast, and color. This allows the display to optimize tone mapping in real time, preserving the detail in both shadows and highlights.  HDR10+ Live encoding (e.g. for sports) always uses frame-by-frame data while VOD content uses scene-based data of which many scenes may be a single frame or a short sequence.