Writing Never Gets Easy?

Louise Glück related in her Nobel Prize-winning Proofs & Theories: Essays on Poetry (1994) that it's a fantasy to believe that writing gets easier and that a writer is always inspired. Glück wrote:

It never gets easier to write. The fantasy exists that once certain hurdles have been gotten through, this art turns much simpler, that inspiration never falters, and public opinion is always affirmative, and there’s no struggle, there’s no torment, there’s no sense that the thing you’ve embarked on is a catastrophe.

However, I believe that Glück meant to advise that writing never gets easy, because like anything that you practice regularly, it will (almost) always get easier, but not necessarily easy. For example, the more you write (about a topic of passion), your stamina may naturally increase.

In the film The Tenants (2005), Willie Spearmint, who was writing his first book, shared that, except for Sundays, he wrote for four solid hours per day. However, Harry Lesser, who was writing his third book, wrote for, at least, six hours per day.

Willie Spearmint, "I work from, like, 8 to 12. Four solid hours. And then I'm out. Man, I tell you, this writing stuff is no joke. How long you go for?"

Harry Lesser, "About six hours a day. Sometimes more."

Thus, one shouldn't be surprised that after writing consistently, that it becomes easier, but it may never become easy, because like Willie said, "[T]his writing stuff is no joke."