I remember hearing something similar from another Miyazaki: Hayao of Studio Ghibli fame. I don't know if he said this exactly or if I'm even getting the right guy, but I believe he said something like this: The issue with anime nowadays is that ideas don't come from creators experiences out in the real world, but rather what they've seen in anime. It all starts becoming derivative and unoriginal, ending up with more fanservice trash and repeating plots and settings.
That's not necessarily saying that you should never enjoy the medium for which you create for, nor does it mean that someone outside of the medium will always have good ideas. However wanting people with more experience outside of games can be a good way to get some fresh and original ideas into gaming.