by the same token, physicists do not yet have the means to make "detailed" predictions concerning so simple a physical event as the detonation of a simple single-stage fission bomb.
just as biologists cannot predict where and when specific genes will change, but can statistically predict quantity of change in a given timeframe under known conditions... so are physicists incapable of predicting which atoms will split into what decay product, in what sequence, which neutrons will be shed, etc - but CAN predict total fissile yield quite accurately.
Hmmm. I think I'd analogize to meteorology instead. Physicists can calculate pretty well the important (from our POV) characteristics of a nuke. Meteorologists, OTOH, can't usefully predict the weather more than a few days out.