After @Calinou mentioned that .glb as binary files are faster to load I've been switching to them from .obj files. I've noticed after you throw the .glb in godot you can open it in a new scene A and copy the meshes into scene B. Then not only can you go ahead and delete scene A, but you can also delete the .glb file in your res://.
If you delete an obj the editor warns you if it's still being used. So... what's going on here? I can just "sneak" these .glb objects into my game and end up with a much smaller game than ever possible with .obj files?
This perplexes me... but maybe this is the best way to do it?