#1 To showcase that just about anything can happen at a WWE Live Event
A lot of us attend a WWE Live Event with the knowledge that nothing significant is going to happen at the show. We generally know that we're going to get a lot of fun entrances, some good matches, but no real storyline developments for the duration of the said show.
And this is why WWE likes to mix things up at a Live Event, every once in a while with a big title change. Even though MSG does not qualify as a typical Live Event per se, it reminds the WWE Universe that anything can happen at a WWE show.
Not very long ago, AJ Styles won the US Championship at MSG. This happened in 2017 when he beat the Champion Kevin Owens for the title.
What a shocker from WWE's booking think-tank to close out the big event!