Cool, some points of view to try to reconcile.
I'm all for collectively trying to find a holistic picture of just what the hell's going on and where we can and should head.
The balance between expanding and pruning is a matter of sampling the entire space of what's out there, discovering patterns, and honing in on the important patterns; then to continue to gather some outliers every once in a while, but to not spend one's whole life doing so. A variety of activities could--but not always--very well contribute to some purpose. Figuring out the best approach takes some exploration and some discretion.
It does seem that some balance is required on an individual level. But whether or not that balance happens on an individual level, it ought to happen on a societal level as per @AphroditeGoneAwry's point:
I figure that some of us are best at gathering a bunch of samples around the space; some of us are best at interpreting those samples, or a subset of them, and practicing discernment.
And also, being too scattered is a bad thing. If I'm applying for a job as a Goodyear tire valve inspector, my knowledge of tango probably won't factor in. Perhaps dancing increases my manual dexterity, which might be useful for the job. Perhaps a coworker and I could bond over a love for tango and thus strengthen our team. Outside of that? Probably not much cross-domain application for my knowledge of tango.