What you’ve been saying is hardly consistent. The idea that dynamic GI is more realistic is just plain wrong, sure it’s the best choice in some situations, “outdoors” is not one of them, “outdoors with a moving sun” is one.
You can do it just fine for outdoor scenes, the things to remember that large outdoor scenes will take a lot of memory to render lightmass, which studios will definitely do but not all people have a computer with enough memory. The other thing is hard drive space, and a large outdoor scene would have a lot of disk space just for lightmaps.