do good books have to be hard?

Lev Grossman tries to answer the question:

After all, the discipline of the conventional literary novel is a pretty harsh one. To read one is to enter into a kind of depressed economy, where pleasure must be bought with large quantities of work and patience. The Modernists felt little obligation to entertain their readers. That was just the price you paid for your Joycean epiphany. Conversely they have trained us, Pavlovianly, to associate a crisp, dynamic, exciting plot with supermarket fiction, and cheap thrills, and embarrassment. Plot was the coward's way out, for people who can't deal with the real world. If you're having too much fun, you're doing it wrong.