I'll add on because I feel there's some dangerous criticism being leveled against WWE and Alexa/Carmella. We have a 35-year history of being able to see what Vince McMahon likes in people he pushes. Yes, looks are a part of it, whether it's tall jacked up guys or conventionally attractive women.
*But* lets be fair here. It has almost never been about in-ring with Vince. It's about your ability to project your character and your ability to cut a promo, or in modern times, deliver scripted lines in a convincing fashion. Kevin Owens has had a main roster run that has wildly surpassed what anyone would have predicted 5 years ago and it's not because of his look. And I don't think it's because of his in-ring either! It's because he can deliver those lines and carry long TV segments. That's a huge asset. That's why CM Punk was the #2 guy in the company for a few years, not because of his look or beautiful top rope elbow. It's why Jericho has been successful for almost 20 years there. It's why they chose Cena over Batista in 05. There are just countless examples of this.
Point being - Alexa Bliss in a lot of ways is the female Kevin Owens! Not in looks or work, although I think her work is underrated, but she commands the screen and delivers their lines well. Of course Vince loves Alexa more than a Bayley who just can't deliver lines in the same way. Charlotte got a big run because she could do promo segments and she'll continue to be a featured star for them. They're trying to make progress on handling non-English speakers like Asuka and Nakamura and Almas, but its still difficult for the way they write TV and feuds. It's easier when the champ is someone who can go out in front of 8,000 people and cut a promo for five minutes and keep everyone engaged. Now, if Mandy Rose turns out to be a terrible promo and they still give her a big push, then its a looks thing. But again that's not necessarily a sexist thing when you look at them trying to have Reigns deliver Cena lines and failing miserably.