@IkariSon
You are deliberately ignoring that it was already explained to you that Ais had a psychological barrier that prevented her from fighting with her full power and prowess against non-monster opponents. This problem was addressed during her training with Ottar, he asked her if she had perceived Revis as a person and told her that when she perceived her opponent as a person she had no chance of winning, that's why his help was essential for Ais to overcome this problem.
So, I wasn't ignoring your argument about the early combats between Ais and Revis and Bete and Revis, but I assumed that it was known by all Sword Oratoria readers that Ais's poor performance was due to this problem, so, Ais's first loss isn't very significant.
So what does it matter that Ais lost the first battle if once she got over her mental problem with Ottar's help, she was able to fight Revis by chasing her like a monster and overwhelmed her during the fight?
You said that when Ais uses tempest-Avenger she doesn't reach a pseudo level 8, so according to your own arguments, Ais overwhelmed Revis in a fair fight, because it was a level 7 vs. level 7 combat, therefore Ais's superiority could only due to her superior combat prowess.
Of all the battles between Ais and Revis, you only take into account the first one, because it is the one in which Ais was worst, so it is the only one that helps you argue against Ais, but you ignore the last one, which is actually the most important because it is in which there is no doubt that Ais is definitely better than Revis, and you cannot say that she won because of Avenger because as we already clarified, they had the same resulting status and also Ais deactivated it before finishing the battle because she heard Bell's bell.
On the other hand, Bete fell in love with Ais because he recognized that she was stronger than him, whose swordsmanship far surpassed Bete (SO8), and no, this perception is not due to Avenger, this is a skill that the leaders of the Loki family have forbidden her to use it and she uses it very rarely. In fact, there is an SS where Loki tells that the first time Bete saw Ais's prowess he fell in love with her, and at that moment she wasn't using Avenger, I know because the monsters didn't explode on contact with Ais' sword, which is what happens when she uses it.
Now, use common sense, Ais is the co-star of the franchise and is the love interest of the main protagonist, considering these facts, do you think it is reasonable to assume that the author would design her as a mediocre character as you like to propose? Also, if she was mediocre, do you think the main character would have needed to develop the most powerful skill known to be worthy of her? it is a simple matter of logic.
Finally, you are right in one approach, Bete, Tiona and Tione are better duelists than Ais, that is no secret, since the author said that Ais is not very good in this type of combat, however, she is much more powerful than them thanks to Ariel, due to this one she was able to defeat Udaeus (the only known case of a character defeating in single combat another with a higher level than the victor, without any advantage) and even more if you consider the "white wind" with which she was able to defeat Revis (level 7). For these reasons, in a single combat between one of them against Ais, they would be on the losing side, it is consistent and also Omori's tweet makes it very clear.