Ayanes a strong character. I use her in select matchups because her basic tools are so good in them. However, I think Hajins overselling her strengths to a fault here. 64H is a great tool no doubt but in no way is it a great substitute for a parry because it fails to do what a parry does which is handle both mid P and mid K. Nor does it shutdown someone from using a mid punch entirely. Furthermore, if a player thinks the Ayane wants to hold that's huge damage potential for the opposing player either by throwing or an unholdable stun setup. But obviously when you start talking about what a player may or may not do in a given situation, especially tournament play, you begin to get away from the purpose of the tier list which is to talk about a characters tools that are available in any given situation. In general I think too much credit is given to advanced holds when measuring a characters strength.
Quick example being Lei Fang and the things we don't talk about:
-She can beaten out of all options except 2k from her punch parry including the catch grab with an 11F or faster move And 2k can be SE'ed.
-Parry abuse leaves her open for extreme punishment (something current lei fangs get blown up for in tournament play, so its a situational fault)
-Cant control spacing at mid and long range because all of her decent options are side steppable/Free steppable.
-Very linear after starting her non kick strings
-1P+K is probably the fifth most reactionable hold in the game. It's like holding a power blow. But if it helps you win online go for it.
And that's just a couple things. That isn't to say shes bad, but alot of the tools shes given props for, aren't nearly as strong as people make them out to be. Realistically she needs buffs more than nerfs.
I also disagree with the Ayane matchups for Christie, Kasumi and Jann Lee because they all have strong options to deal with her and her tools. At worst they are 5-5 for each of those characters on paper(tier wise). Sarah is arguable as well. I'd encourage you play to the better players of those characters if you haven't already some more. And i'm positive you already know who they are. Still, I do agree she has the advantage over Helena and she beats mila up decently enough to make it 6-4 in her favor. But it is what it is.