X. “Of course, if everything is like a dream (mithyA), then the sages and their scriptures are a part of that dream. But that doesn’t necessarily mean that the teachings and the scriptures are not useful for awakening from the dream.”
Y. That is true, in my understanding. ‘Life is a Dream’ (Calderón de la Barca’s play), ‘All the world’s a stage’ (Shakespeare). As to Vedanta, here is what a sage (among so many others) has said: “Vedanta plays the role of the dream lion in this world. Vedantic knowledge itself is part of the illusory world. But then it dissolves the entire illusion of this world, revealing reality as it is.” Sw. Parthsarathy.
X. “If no one dies, then no one is enlightened either, and yet we still talk as if people really do die and really do become enlightened.”
Y. True also. That modifier, ‘as if’, is crucial.
In the next para. you write: “…an individual who appears to exist while not really existing (AS AN INDIVIDUAL) has appeared to become enlightened while not really being enlightened (AS THE PURPORTED INDIVIDUAL).” I have taken the liberty of adding the capital letters, for advaitic sense. Further, while ‘everybody is enlightened’, as Neo advaitins claim, ‘no one is enlightened’, as the sage Gaudapada declared. Are these two seemingly contradictory statements true – and in what sense? *
X. “I think the problem with brain damage is the possibility that a j~nAnI [sage] would lose most or all of the knowledge (including Self-knowledge) that he gained through his studies… “
Y. This is as seen from the vyavaharika (empirical) perspective, which cannot be denied (only understood). Jñani/s (sages) also experience thoughts and emotions. With them, these either quickly disappear, or are transmuted or resolved into consciousness; in fact, they are only consciousness, as mind is also a projection of consciousness.
Something more for pondering: “People forget the reality of the illusory world”. Huang Po.
(*) Gaudapada (Shankara, and the whole tradition of advaita Vedanta) deny multiplicity as being real. In essence ‘all is One’. The Neo-advaitin’s dictum (’everybody is enlightened’) is thus true and false at the same time.