The following is based on “My Struggle.” I haven’t seen the second episode yet. Two decades ago, before “Winter is coming” and superhero shows (on network TV and Netflix), science fiction fans bemoaned The X-Files’s lack of audience. Fox supported it, it stuck around, and it found an audience outside speculative-fiction-fan circles (and got some critical love, too). The X-Files brought “mytharc” into everyday conversations. It had abducted sisters who returned years later—or