5. Just the One 'Alpha-Female' Spot Available
While occasionally it can be a source of frustration amongst so-called 'hardcore' fans of Pro Wrestling, the WWE have historically stuck to a simple formula of having one guy at the top of the roster, allowing those below to jostle for position.
In the 80s this individual was Hulk Hogan, fighting off the constant challenges to his title from legends such as Randy Savage, Mr Wonderful, Roddy Piper and others. Fast forward to the Attitude Era and that spot was taken by Steve Austin.
Vince seemingly likes to forward one superstar at a time to be the face of his company, regardless of how deep or shallow the rest of the roster happens to be.
The problem with an out and out brand split in general means you will always have two champions and de-facto two faces of the company. Sure, one may be elevated slightly higher than the other, but it is still difficult to argue categorically about whether Brock Lesnar or AJ Styles is the current posterboy for the WWE at present.
This issue can be resolved in the women's division by having all of the superstars on one brand. After you've unified the championships there will be no doubt as to who the Alpha-female of the WWE is.
In its current incarnation, this will probably end up being either Charlotte Flair or Ronda Rousey - both are very marketable individuals with a degree of prestige behind them. Once this is in place, other women like Becky Lynch, Sasha Banks and Alexa Bliss will become the chasing pack, giving Flair or Rousey the same kinds of challenges to their throne that the aforementioned stars of the 80s gave to Hogan.