#1 Too many Wildcard appearances
The Wildcard rule is one of the worst decisions WWE has taken in recent times. What started as "3 people are allowed from each show to appear on the other" has gone out of hands with as many as 6 superstars appearing from SmackDown on RAW last week.
The rule has pretty much made the Brand split insignificant with so many wildcard appearances each week. Superstars like Roman Reigns, Kofi Kingston, Becky Lynch, etc have made a habit of appearing on both shows each week, which is restricting those who need some TV time from getting it.
WWE has already announced Roman Reigns to appear on RAW tonight in a 6-man Tag Team match alongside his cousins, The Usos. But WWE should avoid having so many superstars from SmackDown appear on RAW tonight, especially in meaningless segments and matches.
It would be better to give opportunities to the underutilized superstars on RAW to get some screen time and showcase their talent.