#2 Fewer opportunities to other talents
In the previous slide, I mentioned how she could have two matches per PPV. But one huge problem with that is, it gives one less superstar the opportunity to compete in a title match on the PPV. It would be like Becky vs Miss A and Becky vs Miss B, which is something not encouraging to the talent backstage.
WWE currently has one of its best-ever women's division, with a plethora of talented female workers who can give even the men a run for their money. Superstars like Ruby Riott, Ember Moon, Bayley, and many more are waiting for their turn to shine, and that would become a problem if WWE keeps both the titles on Becky.
Becky can still rule the division on one brand, but keeping her at the top of both brands gives one fewer woman a chance to be the champion and show her worth.