Once an engrossing but problematic show that alternately decried brutality and wallowed in it, that simultaneously valorized and exploited its women, ‘Game of Thrones’ has become more empathetic, complex and progressive in its final leg (though its racial politics remain iffy). Indeed, there are times when ‘Thrones’ seems to be subtly apologizing for what it used to be — wondering, like many of its characters, about the point of it all, and waving away simplistic answers.