I think you may be right. People had quoted the kindle vs printed books where it was thought to have broughy the demise of printed books but it turned out to be the contrary.
Issue is here hard to find every printed books title on digital book! Not only that the price difference is just usd$2-10!
Who want to go digital? If it's 50% off ppl would go for it. Ppl see digital book as high profit model. No need to get factory to print, no cost of ink, paper, warehouse space to store, no shipping cost why just few dollars cheaper? Like that might as well buy the book at least can show, still can sell on used market, end up cheaper than digital copy. Publisher worry about piracy. No efforts to combat. To combat drive price down! Not dying to keep margin higher than paper
The marketing or direction of digital book not that right.
Then again books and watches very different , not exactly apple to apples