xG says nothing about where a team should be in the table, watch the game with your eyes and stop being a nerd.
xG does not catch game momentum. You could be losing 3-0 and then produce five huge chances when the other team strolls and sub their best players, and end up with an even xG. A good team (United) that scores early from a fluke can defend a lead pretty comfortably and end up with an xG at 0.2 vs. 1.5, and it says nothing about the game or strength between the teams. If the other team (Newcastle) equalize after 30 minutes, the first team can/will up their game to score another - but this does not show in xG. Football is about scoring more goals than the other team, you do not get more points for scoring more goals if the other doesn’t score. A high xG but losing early on and losing the game, says nothing about the game if the scoring team is cruising.