#3 Two-hour kick-off show
Last year's WrestleMania 34 lasted for almost five hours and this is just the main show. If you add the time of its kickoff show too then it will make 'Mania seven hours long, which is certainly too much of wrestling and taking for even a die-hard fan.
Moreover, I think WWE should cut the WrestleMania Kickoff to one hour only and they should use the remaining time for promo segment and talking shows like A Moment of Bliss, or Miz TV, rather than legends from the past arguing the outcomes of the matches.
That being said, if WWE decides to make WrestleMania Kickoff show one hour only then it'll be easy for fans to pay more attention as it will be filled with more meaningful segments rather than airing some pointless video package of the upcoming matches.