Just want to add that using data from a game engine gives you perfect camera poses associated to each image. That makes training of nerfs and GS a little easier since there is no error from camera pose optimization. That's also the reason early Nerf papers used the famous yellow Lego excavator rendered with blender.
one of the fundamental problems in photogrammetry is determining the position of the camera in 3D space, with a game engine you just have a concrete value for your camera position, removing that entire problem. I don't know too much about photogrammetry but i'd imagine once your camera position is 100% accurate it's a lot easier to construct the point cloud accurately.
