Should not end the brand split: More time to spend on storylines
One big advantage of the brand split is the ability to keep storylines and angles developing on a single show instead of spreading out over the entire WWE.
With Superstars sorted into different camps, the storytelling becomes easier because there are less extraneous elements to factor in. It's easier for the creative team to 'connect the dots' for the basic plot path of a wrestling angle this way, simply because the cast is smaller.
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A good example is the last 'frenemies' saga between Sasha Banks and Bayley. The Hugger and the Boss have been teeter-tottering back and forth between being friends and enemies for some time now. It has been teased that one or both might end up turning heel before it's all said and done, but the angle has been played out so masterfully that it's still an enigma as to what's going to happen.
If the brand split ended, the women would not likely be given as much time to develop their angle, and the wrestling fans would miss out on well-sequenced drama.