[Senator Clay Davis]

Like all advanced stats what xG is really trying to show is what teams do the most repeatable elements that cause success (i.e. wins). Scoring a lot of tap ins is far more repeatable then scoring a bunch of worldies, and the reverse is true for defense where conceding worldies is better then conceding tap ins. Perfect example this year was Man Utd and Leeds where United scored 5, but had an xG below 2. They scored some great goals, but if you played the exact same match 100 times they would rarely score 5 goals and the most likely total across 100 would be 2.

But like a lot of advanced stats the flaw is in applying context, it looks at every situation is the exact same. But it's still the fairest and most consistent way to evaluate by taking bias out of it.