I think it's not too implausible that something like this could be real in the distant future. Most would rely on the collective biological-abiological-hybrid h

I think it's not too implausible that something like this could be real in the distant future. Most would rely on the collective biological-abiological-hybrid hyperbrain(s) for most things most of the time, but (biological or otherwise) individuals or sub-collectives/colonies would also narrowly specialize and rely on local processing when they believe their specialized cognition/ideation is more effective/efficient than deferring to the collective. Or when they just want some privacy. Entities would be able to seamlessly "context switch" between the different scales of shared memories/knowledge/mental models, from universal to individual. Hopefully with some rigorous isolation so that only you can ever access your individual mind. Maybe also some vandalism mitigations for those who might want to mess with the universal Neurapedia. Plus some kind of hardware switch that can fully cut the connection at a moment's notice, in the event of some neural 0-day or DoS. In practice it might be infeasible to make it both seamless and safe from adversarial risks, but people said the same of Wikipedia. Though, the consequences of a manipulated Wikipedia article are probably a little different from the consequences of a manipulated neural interface/network.