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just because you can go the wrong way and find a dead end doesn't mean the region is nonlinear you retards
pokemon has always been linear as fuck, the only exception being sabrina before koga in gen1 and judging by the obvious level gap between them it might have been an oversight anyway as there was obviously an intended order
if you're talking about optional areas, a shot of a single corridor doesn't indicate the absence of them, and SM had optional areas just like the games before it