SOME PLAYWRIGHTS, NOTABLY ANNIE BAKER, seem to write on the molecular level, building up from pauses, glances, and scraps of dialogue. Others, such as Itamar Moses, are more macro, toying with big ideas and structures and letting drama—or warped comedy—trickle down. The Berkeley-born playwright Anne Washburn does both, concocting extreme scenarios and filling them with keenly observed offhand speech. “10 out of 12,” which ran at SoHo Rep this summer, was set at a tech rehearsal for a play, which theatre people know to be excruciatingly boring but which, in Washburn’s hands, had an almost ritualistic beauty. Stranger was “Mr. Burns, a Post-Electric Play,” a postmodern triptych, which was staged by the Civilians in 2013, at Playwrights Horizons. In the first act, survivors of a near-future apocalypse comfort themselves by…