i see indeed some similarities in your idea but also some real differences and because of that your perspective is a more positive one than mine i think
it more or less seems that the land in the BOTW2 will be the same as in BOTW1, probably with some changes, but how much, enough to feel fresh? (1)
BOTW2 will normally have actual dungeons in it as far as we know, this contrary to BOTW1
BOTW1 was very obviously focused on the overworld as also...