When he gets to his London office on the morning this piece is published, Jesse Armstrong will read it in print, or not at all. Though the building has wifi, he doesn’t use it. “If you’re a procrastinator, which most writers are, it’s just a killer.” Online rabbit holes swallow whole days. “In the end, it’s better to be left with the inadequacies of your thoughts.” He gives himself a mock pep talk. “‘It’s just you and me now, brain.’” Today, the showrunner of Succession and co-creator of Peep Show is back at home, in walking distance of his workspace....