I am easily overwhelmed, apparently. I am only slightly familiar with Paizo as someone who jettisoned PF1 a few years ago and never really got into their novels, lore, etc.
Just the background history of the second volume of the Age of Ashes AP, and I was completely lost. I couldn't even tell the party why they were doing the mission and couldn't understand enough of what was going on to reasonably explain the villain groups, the locations they were based in, or anything else.
Age of Ashes could've been an anomaly with teleportation gates linking various places with an especially ancient plot, but I tell you, I lost all interest in the story after the party rescued the goblins midway in the first volume. That was the only part that seemed to have any connection to the characters, their town, or anything based in the "here and now."