The armor didn't take hold all at once, if you recall.
When it first started changing her, like he said, it would have been easy to reverse. The player had time to do so. The game even tells you that.
Once her gender actually changed though is a different story.
I don't quite get what you're implying here.
Gender is just dependent on the person and what they
feel. The game clearly states that it's no biggie at all for Brienne to return to Brint with just a few potions physically. How does Brienne's gender affect Ryn's vag?
And if you recall,
the reason Arona had to do all that bullshit to get a cock isn't because it's very hard to give a dick in CoC's world where every girl has a dick. It's because according to Arona there aren't any alchemists in the Sailgraves that know how to do it so easily.
I mean, Liufr themselves is a character you can easily turn into a girl or a boy because again, it's really easy in CoC's world. Agnimitra can instantly grow a dick if you want her to just bring her some alchemy bullshit.
There's tons of examples.
Ryn not being able to get a womb despite constantly bitching about "wanting to feel like a true woman" is just peak Savin and little else. The lore already allows for easy transformations by nature, and even if it hadn't they could just do it anyway because they write whatever they hell they want.