#1 Not making WWE Championship matches the main event
The last time we saw the WWE Championship in the main event of WWE's flagship PPV was at WrestleMania 32, where Roman Reigns defeated Triple H for the WWE Championship.
Since then the WWE Title is seen left off not only in the main event of WrestleMania's but also at the other PPV's.
Therefore, if WWE continues their tradition to put WWE Title match in the starting of the upcoming WrestleMania's then it will be a horrible decision, as it is WWE's top title and if it isn't in the main event of WrestleMania 35 then it's absolutely unfair.
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Guys like AJ Styles are more worthy to be the main event of The Showcase of the Immortals than any other superstar, therefore, I think this is a meaningless decision to not make the WWE Championship match the main event of WrestleMania should come to an end, it'd good if WWE understands it as soon as possible.