The question I have is why? Why does a casual with zero interest in high M+ keys or Mythic raiding need gear at ilv 220+? Sure I get that we all may want BiS top end gear but for most players, reward = effort put in and for a casual, the effort is relatively low in comparison to a dedicated Mythic raider who also pushes high (above 15+) keys on a regular basis including Tyrannical weeks.
And then there's also the question of effort on the part of the casual: Honestly it doesn't take much effort to clear a handful of +4s for the weekly chest or even do a few YOLO RBGs up to 1400 PvP rating (even as Alliance).