A Place for Telling

In the writing community, there is a stigma associated with exposition. New writers--old ones, too--are constantly admonished to "show, don't tell." In other words, write like this: "He took Lizabet into his arms. His lips felt cool on her neck." Not like this: "Ned and Lizabet embraced."
But, lately, I've noticed a backlash of sorts. Expositionists are pushing back. They say, "You can't show everything. Books would be way too long."
Who is right? Neither side. There is a place for both showing and telling. How much of each is a question of style.