Basically, the idea behind “True Transformation” is that it changes what you are down to your core, to the point where any form of dispellation would take you back to that form, not any other. It needs consent to work, however. Hence why Sarin makes this speech.
The Dragon Doctors
Battling evil and curing what ails you!
…hm. I just noticed that the first panel shows the primary argument taking place was Sarin and Mori trying to convince Goro. Pretty telling, given what happens later.
It’s reassuring that True Transformation requires consent, but could that consent be achieved by mind-affecting charms, or coercion?
As it is a spell that requires consent to the very core of your being I’d say no, as those methods don’t change the core of your being, only the outer layers.
This speech is reminding me of how I get edgy when an app requests permission for something vague like “view and edit files and folders on your device.” Like, say I’m installing a game. I understand that viewing and editing files is part of how the game works- it needs to load its sprites and backgrounds, store save files, etc. But it doesn’t need to be able to edit all my files to do that- just the ones it put there in the first place!
Similarly, Smith doesn’t need to give Sarin the right to change everything he is, any way she likes, in order to have this procedure- he just needs to decide what he wants to become and consent to her making that happen.