This tactic works only until someone learns of it.
This rather seems to apply to the weaponized transfiguration in general. Compared to identifying and removing Aluminum that is dispersed into the cells of the brain—never mind trying to fix existing neural damage—is far more difficult than defending against the whole class of transfigured gas attacks.
There must be better substances to use!
That particular tactic is, of course, an optimization within the domain “transfigure arbitrary commonplace solid”. Did you consider the alternate substances discussed in the comment to which you are replying? Are there some superior options to those that you would suggest? Creating the perfect magical terrorist attack is naturally of great interest.
This rather seems to apply to the weaponized transfiguration in general. Compared to identifying and removing Aluminum that is dispersed into the cells of the brain—never mind trying to fix existing neural damage—is far more difficult than defending against the whole class of transfigured gas attacks.
That particular tactic is, of course, an optimization within the domain “transfigure arbitrary commonplace solid”. Did you consider the alternate substances discussed in the comment to which you are replying? Are there some superior options to those that you would suggest? Creating the perfect magical terrorist attack is naturally of great interest.