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Gen 1/2 were sort "open" in how you could progress. The games became more scripted when they started to focus on story experience and to keep younger players from getting lost. Only now realizing that getting lost in the wild is what the people want (after success of Zelda and other similar games).
Open world is I think an alright fit for the series. But the game world we have now is just low quality on a creative and technical level. Apart from maybe Area Zero.