I’ll speak for myself:
I don’t think watching a let’s play is even remotely equivalent to playing the game. Personally, I enjoy them in fundamentally different ways. Regardless of genre, if choice–in whatever shape that takes–is involved at all, a large aspect of the pacing is then player-controlled, and that’s a big reason for why I come to games in the first place.
Since it was already used as an example: Watching someone play Nier:Automata (or any game) means being subject to their whims, and what they think is interesting. I might love whoever’s playing, but that Venn diagram isn’t ever going to be perfect. You could skip through the boring stuff, but then, why not just read a wiki summary? In for a penny, in for a pound, I say. I think this is especially relevant for a game with as much optional content as Nier:A has.
Further, my favorite games have relied on the player’s interaction to settle whatever emotional payload they’re dropping. Nier:A isn’t one of my favorite games, but the final moments would’ve been meaningless without having shouldered the toil required to get there (and that had little to do with how difficult the gameplay was).
My point is this: The act of playing a game transforms the experience, irrespective of the mechanical complexity. Even more to the point, I believe that’s something Yoko Taro knows very well.