Really I doubt that hearkening back to gen 1 is what they're going for. And even if it were, that's not a great way to do it. They just happened to do something that was like gen 1 in a way that wasn't great, as I think BP was saying.
Imagine if, in NSMB, the "can't scroll left mode" wasn't an optional feature, but was part of the game proper. It wouldn't be "so nostalgic" as much as it would be pointless and frustrating.