Scene.GetRootGameObjects() is not exposed so it would be great if there was an alternative static method provided that returns an array of the root GameObjects in the scene.

For example:

GameObject[] rootGameObjects = new GameObject[VRCScene.rootCount];

VRCScene.GetRootGameObjects(rootGameObjects);

or simply:

GameObject[] rootGameObjects = VRCScene.GetRootGameObjects();

Reference: https://docs.unity3d.com/ScriptReference/SceneManagement.Scene.GetRootGameObjects.html