No that would be amazing. But we don’t have the technology to map all the connections in large mammalian brains. It was done in the fruitfly just this year: https://www.science.org/doi/10.1126/science.add9330
Useless? No, but by today standards it doesn't amount to much. It's like having a low res pic in black and white. It worked alright in the past. That's the point.
