I do a lot of renderings for custom residences in mountain settings that require using custom drone 360 panoramas for skyboxes to capture the views correctly. The biggest issue I have with this is the lost ability to control the sky, clouds and sun.
I notice that the pre-installed horizon images (Desert, Forest, Mountains, etc...) are essentially a skybox panorama without image data for the sky. This allows the use of Enscape's Procedural clouds. It would be great if I could create my own skybox that maintained the ability to use the procedural clouds.