If Rey Mysterio can win the WWE/Heavyweight Championship then why not??
Because Ray is a million times the wrestler that Tessa Blanchard could ever dream of being?
Plus at least when Ray won the belt he always played a massive underdog and never wrestled 50/50 match's, you could suspend your disbelief without insulting your own intelligence. That's clearly not the direction they're going in with Tessa.
I'm not saying there can't be believable woman competing with the guys and winning the men's world title. Chyna could of worked and so could Awesome Kong. Tessa Blanchard ain't no Chyna or Awesome Kong.
WWE got the woman's revolution right. Make the woman's world title seem just as important as the men's and give it main event matches when its warranted. Tessa Blanchard winning the mens world title just hurts everyone including herself in the long run.
Her being world champion is about as outlaw as you can get. Decisions like this are why the audience watching wrestling is shrinking constantly.