>"Primal Beasts are ideas given form or already-existing creatures changed so that they can be used to do whatever their Astral masters want. We know that if the Primal's body is destroyed, they'll go into sleep-mode as a simple core while they're regenerating their powers."
Yes I am very aware of that and i've also done alot of research on it here (https://youtu.be/IuFRZaG_exs) complete with mythological references and 22 different things backing up what i'm about to tell you. You are thinking so far along the lines of how i'm thinking. But the thing is, there actually aren't any existing creatures that were turned into Primal Beasts. The only one that ever happens to according to GBVS is Bahamut upon turning into Proto-Bahamut. It was reduced to being a Primal as the Astrals had done to it. Primals are generally manufactured beings used for war purposes. Be it as a sentient device or as a sentient weapon.
In the conversation that Nezha and Medusa was having with the crew in Primal Resonance, the things in which Nezha was saying in terms of how Primals being looks contradictory to what they actually are is in reference to the Primals simply being Cores. These Cores are created by the Power of Origination(Astral Power) and Sky Essence. In the making of their Core, the Astral creates their body the way the Astral wants like you've said. But beforehand, they come up with the idea for their design, just as Lucilius did when creating the 4 Primarchs. Ontop of that like you've said again, when beaten (or rather killed perhaps.), they go into a sleep mode to recover for who knows how long until they are able to manifest their body through their Cores again. When their Core is destroyed, the energy used to create them being Astral Power(Origination) and Sky Essence releases them from the Core and they die permanently or Chaos Matter use skips the rule of them going back to their Primal Cores and then just straight up die from a lethal blow from it.
It also shows that due to Cores simply being objects, they are genderless. As due common sense, objects don't have sex or gender. But of course gender is a label so, when they manifest they get one. They are what they look to be.
>"I can't think of a Primal who can either alter their body freely however they want (so transformations like Phoebe to Oneiros don't count) or created themselves a new body after waking up. There might be one like that and we just haven't seen it yet."
There isn't a Primal that can alter their body freely as it is impossible. They cannot go against their master's designs because that is how they were created to be. They were given specific functions to do specific things. That's really all there is to it. Only people like Sahar and Shalem can alter their designs, but they aren't even Primals. Now if they were given the ability to do something like that, then that makes sense, but it doesn't make sense for Satyr to do that because that was never even the context it was being put under and with that, it also contradicts everything Nezha was saying beforehand. Because it'd be like every Primal is the opposite gender and a complete controversial false gender-fest. Cygames would never do that.
>"Satyr posses that ability, then that'd be something rare even for Primal Beast and it would be something humans can't comprehend. It can obviously mean a lot of different things as well. It could be that she can create food out of thin air. It could be that she suffers no ill-effects when eating rocks."
I already made that clear though, because it is a Primal ability. With that said, it wouldn't even be something THAT simple as that yet again doesn't make sense. Considering that it held enough importance to be cut-off, these possibilities are quite obviously limited to the fact that they're godlike weapons. They are not only Cores, but weapons of war, another thing Nezha was referring to in his conversation with the crew and Medusa. The characteristics of a Primal in the first place by the way, are just power or ability in which would hold high importance due to being cut off.
Edit: I never read that properly when you mentioned "If Satyr possesses that ability." While what I do mean to say what I said here, to say that Satyr having the power to alter her body going is beyond the understanding of humans is completely false. Theories and even attempts was done to be able to do something like that in the first place, meaning it is already an understood concept by Skydwellers. Also, you may as well be running the company into the ground hiding that like it deserves a WHOLE event behind it or something.
>"Whatever it is, "community's line of thought" is free to go wherever it pleases, because speculations can be fun."
Speculations may be fun, but when it hits certain territory, it stops being fun and causes problems. Ontop of that, the things thought of, which are most often along the lines of Satyr being a mixture of sex or gender is not only annoying but makes zero sense given the narrative. To say it has anything to do with altering your body's sex or gender is probably the most boring, unimportant thing ever that would easily cause backlash because it wasn't even said in the first place. But i'm just speaking hypothetically here because what was being conveyed has nothing to do with that.
>"Her ability being something only a Primal can do doesn't really delete any possibilities as of what it could be."
It deletes a good number of possibilities because of the narrative. To say this quote here, is to ignore the narrative and what happened during that time. Especially when the things that're being said write off all that gender nonsense. It is due to these speculations that people jump the gun and call something completely ridiculous "canon" when it isn't.