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What you people need to understand is that big open fields do not necessarily mean crazy non-linearity.
They just need to make regions that feel organic, like real places with a lot of space, and not small artificial looking pathways designed by a robot. They took steps towards this in Alola already at least aesthetically, in terms of actual playable space it's still complete garbage and somehow even worse than before.
Small grid-locked routes were fine in the GBC because of hardware, but it's not in any way anymore. They can have big, organic, open and layered areas and still maintain the same structure and progression, only this time with actual explorable terrain and space to have adventures in while you go from gym to gym.