#3 Asuka's limitations as the Champion
I will never dispute the fact that Asuka is absolutely incredible between the ropes. But that's not all a Champion is expected to do, and if you look at some of the greatest ever, like Hulk Hogan or the Ultimate Warrior, they weren't great workers.
In my honest opinion, Asuka's limitations on the microphone often prove to be a detriment with regard to her push in the main roster. This is probably why her undefeated streak came to an end after her classic match with Charlotte Flair at WrestleMania 34.
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I do not understand why she is not aligned with a mouthpiece, like Lashley has or the AoP has, on RAW. I suppose they believe that managers are only good when they're accompanying heels and are a waste with regard to babyfaces.
I wouldn't be surprised if Asuka is a transitional champion, who loses the belt very soon indeed.