#except now geoff is seven feet tall and has been stuffed into a body like a badly taxidermied olympian athlete

[thestuffedalligator]

The capital-P Point of Frankenstein is that the creature is a blank slate. Tabula rasa. He's an Adam who was foresworn by his creator with no understanding of the world, and has to slowly, bitterly, painstakingly develop that understanding.

It's a literary choice made as part of the grander allegory that does not need to be interpreted literally by a modern lens. Mary Shelley was writing a fiction and it's not important that it's not how bringing a brain back to life would actually. Y'know. Work.

That being said, there's untapped comedy and horror in a retelling of Frankenstein where the creature does have his previous life's memories.