Now let me ask you, can you describe all the ways that it can be used? I doubt it
Absolutely, because there are far more uses for paper than the max post size would allow me to list.
You may as well say "Can you list all the integers? No? Ergo I've made some point"

Note my posts are made as someone who is a beginner, not as someone who is a teacher. However, I can read the posts from other teachers.
I did point out to you in the other thread that whatever you say as an experienced teacher, I can find another, perhaps equally experienced teacher who will say something different, even the opposite. i.e The net result is that the experience counts for nothing.
Don't get your knickers in a twist with what I just said though - all I'm saying is that if one great teacher says "No need for Hanon" and another great teacher says "Use Hanon, it's essential" then collectively they have no better answer to the question than if you just threw a coin in the air.
At least until you said "Why?" and they said "Well, I just threw a coin in the air" [although compared with some of the "because the other guy doesn't know what he was talking about" and other stuff you might read when you ask, it's not that bad

That's why there is debate on these topics.
For a beginner trying to find a teacher and learn that's frustrating, because you don't know who to believe - and Hanon is just one example. There are countless others.
I also doubt you would know how to apply Hanon to a developing student because you have determined it cannot be used.
Not strictly true. I haven't said it cannot be used, it's sheet music composed for the piano after all, you can learn to play it just as much as you can learn to play anything else.
If you read my point it's that "how to play" is more important than "what to play" - you know that's true, because you hope to charge folk to teach them how to play whereas any shopkeeper or website can sell them what to play and as I've shown above, if the shop keeper gives you Hanon or tells you to avoid it, they are saying the same thing as some great teacher does.
But how to play is far more difficult a problem. Hanon can't teach you "balance..." or whatever other aspects you'd list under "how to play" - however, someone who can teach it, might use Hanon to do it. imo attributing that, even if it's successful, to Hanon is flawed, and I think the teachers that don't use Hanon show that. However to me, both focus on Hanon as though it matters when it's just sheet music. [perhaps partly because of the blurb about "fingers high" though which is largely dismissed by everyone afaiaa]
I guess my opinion is - if I go and buy Hanon without reading anything else then I'm reading his bollocks at the front....but if I realise that and go and buy Hanon and ignore that stuff, then I'm still likely to be playing Hanon incorrectly...if I realise that and find a teacher, then as Hanon is dead it won't be him that helped me achieve balance and so on, I'll have gone past the point where what to play matters, but if the teacher wants to attribute it to Hanon and not to them, so long as their bill reflects that, there's probably no point arguing

But why do I want to offer debate for the experienced pianist to study Hanon?? Just because I offer no debate for it does that take away from the fact that Hanon is essential for the Beginner?
No you misunderstand. Since your argument is only for the absolute beginner I was just pointing out that there's no need for a counter argument to consider beyond that early stage.
i.e So long as one person, who isn't an absolute beginner exists, who didn't use Hanon, then Hanon being essential is clearly flawed.
Others however, including Hanon, see Hanon differently and they would argue from the pov of an experienced pianist playing it.
So the point wasn't that you should have made an argument about experienced pianists using it, it's just that because you didn't it's trivial to see that your argument is flawed thanks to the large number of experienced pianists born before Hanon released the exercises, and those who followed after him that didn't use it.