Took some more photos with @halide to try and understand HDR and the 14 Pro main sensor.
Zebras etc are based on the SDR range.
On one shot of a backlit ridge I had to drop down to -2.0 to get rid of them in the sky. All content in the RAW file is within SDR range, but raising shadows that much leaves them lacking detail and color.
Follow up shots from -1.2 to -0.9 have nearly equivalent looking blues in the sky, ~2-3 stops extra info in unprocessed RAW, and shadows look WAY better.