It's worth noting that SE and Wikipedia are two of the most valuable reference resources human civilization has produced, ever in history. Maybe the reductionism contributes to their high level of signal.
Annoyingly often it is also the most useful questions that are closed while things I consider trivia style/karma-farming operations like: "what is the reason for x" seems to be totally OK.
I too find those trivia questions and their answers interesting but IMO they are a distraction.
As for Wikipedia, I'm almost convinced most information on it is erroneous, unverifiable, or useless in the forms it is presented. I've stopped making contributions and try not to ever reference it at all.
ie. I could just as accurately say: maybe their value as a reference has led to reductionism. We can't go back and do an experiment, so we'll never really know.