I think you can look at it like this. Who has come out of a feud with Alexa better off than before? I think she is a Hunter project because her feuds seem a lot like Hunter's biggest run in 02/05.
Its not her fault the Nia matches were bad. Nia is really bad, but Alexa is not good enough to go that long in a match without someone leading her. I think that is why they did not do the feud the first time.
Her promos are scripted similar to Miz, where she gets to say things to bury the face and the face is not allowed to retaliate. Both also win way too many matches cleanly. I don't know who has the mentality heels should win matches cleanly. But its one of the worst things WWE does.
Heels like Miz and Alexa should not be winning matches cleanly. Alexa having a knock out punch feels like Alexa fan fiction.
I actually absolutely believe that heels should win cleanly (at least sometimes). It drives me absolutely crazy when someone turns and all the sudden they can't win matches cleanly, like overnight. It also gives the faces a challenge to overcome other than cheating, which alleviates some of the intuition to start putting gimmicks around the match that should "even" the odds. I also draw a distinction between bending the rules a bit throughout the match to get an advantage or maybe even going past the line of sportsmanship and cheating to get the actual decision. The former is something that should be built into a heels DNA, the latter should be used fairly strategically. Heels shouldn't win clean ALL the time, but I find the pattern of heels only (or even the vast majority of the time) cheating to win super irritating.
Spot on about the nature of Alexa's promos and who has come out stronger (or more accurately not) from her feuds, but I really attribute that to them not sticking with much long term for her (aside from Nia). To me, the Sasha feud left a lot on the table. Sasha and maybe even Bayley came out worse for feuding with her because it felt - at least to me - like things moved forward unresolved ultimately. I also think both of those two at least have been the product of waffling booking for a long time now so I am hard pressed to pinpoint a single thing that caused their decline in standing. Both were overdetermined in my mind. Bayley did get buried in those promos though, but that was at least part on her for not being ready for that.