>>34285257Allow me to play Devil's Advocate for that.
First off there's gonna be an issue of perspective, if they make the overworld models have realistic sizes, the larger Pokemon such as Steelix will run into the problem of clipping into the background or obscuring the player character. And if they give all the model's similar sizes it will feel awkward and break immersion.
Second, them having the assets does not mean that they'd have the space in the game to allow for them to do that. Because let's face it, Gen Seven aren't the best optimized games.