Just as another counterpoint to this, if you look at https://en.chessbase.com/post/the-future-is-here-alphazero-learns-chess https://en.chessbase.com/post/the-f

Just as another counterpoint to this, if you look at https://en.chessbase.com/post/the-future-is-here-alphazero-learns-chess https://en.chessbase.com/post/the-future-is-here-alphazero-l..., they point out that there are a number of positions where AlphaZero definitively outplayed Stockfish in a non-opening position. There is definitely more going on there than Stockfish not having an opening book.