#8 Invasion angles

Why WWE doesn't do invasion angles more often is anyone's guess, but they can usually make for excellent programming. Beyond that, it makes for those once in a lifetime moments that fans absolutely dream of one example of this was the invasion angle on the Raw before Survivor Series, which featured a brawl between Rousey and Lynch.
If nothing else, that was the moment when WWE was at their best and they would be smart to do this again. Of course, WWE doesn't like to do invasion angles between Monday Night Raw and Smackdown Live most of the time, but one can't deny the ratings boost it would give the company if they did outside of Survivor Series season.
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They also can't deny that this would be a way to have superstars on both shows without outright ending the brand split, which would be another huge advantage. In the end, it will create a chaotic atmosphere, put both shows at war and probably be the best way for WWE to boost ratings.