If I think back to Eddie when he was in charge of Australia, it was so about running rugby.... Admittedly with backs sharing various positions (i.e. 15s and 12s that could play 10)
Wasn't his Japan side also developed around a running game?
Maybe, what we see if him with England is where he feels our strengths are.
He could play a more expansive game with us, but maybe we couldn't compete in that area against a New Zealand or an on form Australia.
However, maybe he feels that our power, territory game is capable of out putting South Africa and nullifying the others
I genuinely don't think that Eddie ignores an open/running type game of he feels that's appropriate...
Rightly or wrongly, he doesn't feel that's appropriate for us