#1 WWE Championship match in the Main Event

The card for SummerSlam 2018 has 13 matches scheduled for the marathon show, this includes 3 matches on the kickoff show as well.
From those 14 matches, 2 have a legitimate chance of ending up being the final match, the official main event of that show - The Universal Title Match and The Raw Women's Title match, mainly because both of those matches have a part timer fighting for a top belt in that division.
What pains my heart so much is that a match for the WWE Championship, the so-called most prestigious title in WWE history is not even considered for the main event slot.
While not having it in the main event of a big four event seemed somehow OK, the fact that AJ Styles, the WWE Champion since November last year has not main evented a pay per view since February is just mind boggling.
Even the dream feud between him and Shinsuke Nakamura didn't get a single main event match in four consecutive pay per view clashes.
WWE has clearly degraded it's very own magical creation to the point where fans know in advance that they are not going to see it in the main event. How about shocking the fans by giving them what they want.
While it is a long, long shot, considering the AJ/Joe feud has been a secondary priority for WWE even on SmackDown, how great it would be to see the WWE Title match in the main event of the second biggest show of the year.
Styles vs Joe is a dream feud for the entire wrestling fraternity, and watching their two favourite stars fight in the main event of a show would bring out the best not only from the fans, but also result in improved performances by Joe and Styles.