They kinda used the artifact weapons to cover for some of that, during Legion our characters were at a power level that won't be achieved any time soon, because of the artifact weapons.
Now that we are losing them we are back to a power level much closer to what we had before Legion.
But really the player character has stoped making sense a long time ago, ever since they started making our character a major piece in the story.
In return though we get some cool stories, its all a compromise in the end.