Just two of the things I loved about the glitzy and glossy and deliciously depraved Netflix series “The Perfect Couple”: 1. It runs for six episodes, and six episodes is just right. No padding, no time wasted on irrelevant subplots, no dragging things on to fill out a nine- or 10-part story. 2. When it ends, IT ENDS. The central mystery is solved and a myriad of storylines involving the...