Notice how online paper specs skip over the hand feel, which is key for a repair that lasts. You can see weight and grain on a screen, but you can't tell if it will fold softly or crack. That missing info leads to guesses, and guesses lead to bindings that fail sooner. Shops had that knowledge in the air, passed from person to person over the counter. Now we rely on customer reviews, which are often about shipping speed, not paper quality. So we get faster deliveries but slower learning, and the books suffer for it.