Earlier quoted context omitted.
The Blue Brain project managed something “as big and complex as half of a mouse brain” in 2007, so I think your claims of not-even-insect-level are outdated.
Not so sure that claim is right : http://www.artificialbrains.com/blue-brain-project Seems like they managed a honeybee (but I am not sure that it ran in real time or how they validated that) but were hoping for a rat brain. I'm quite sceptical - I don't believe that there is a good understanding of how a single neuron functions, or agreement on the taxonomy of neurons or an understanding or agreement on their intera…
That said, isn’t the point of the Blue Brain project to answer your skepticism? When we have all those things, the only thing remaining is to see what can be left out of the sim without compromising the behaviour?