Exactly, Japan had to conquer half of Asia to get it's materials for the economy!
I don't understand your first line though.
Possession of raw materials isn't important. Access to them is. You don't need imperial expansion to have access, as Japan's post war economic success demonstrates. Asia suffered from Japan because Japan didn't know that before launching the wars. Which, to be fair, was hardly unique to them at the time.
The Japanese Islands have both positive and negative features, like the British Islands. It was hard to invade them, but they were limited in some things domestically.