i think the difference is that Ghibli Hills
is not necessarily uninhabited, but rather that unlike Arcadia
, the people in it are not what characterises it. Arcadia is about the land and the farming community as a whole, Ghibli Hills
is a landscape. The former is a place for the heroes to stay a while (or remember fondly), the latter is a backdrop to heroes on the move. There may be places to rest in the Ghibli Hills
, but they belong in their own tropes.