We don't know yet if it is suitable for AAA studios yet, as no yet tried. But Unity itself for quite a long time was not suitable for AAA studios, and just quite recently AAA games using Unity popped up. I'd say that Godot has got the essentials, and most of what is missing is pretty easy to add yourself. Maybe the last thing that stops AAA studios from using Godot is that it still uses OpenGL ES 3.0 for rendering, but there is plans to use a new renderer based on Vulkan