"Big Thinking doesn't work" is the core tenant of postmodernism. And the postmodernists have a lot of real-world examples to justify that belief, long-term plans that didn't work out and left everyone worse off than if nothing had been done at all. Even mainstream scientific philosophy places empirical observation over contemplation, because contemplation is notoriously inaccurate.
In other words, if there's a famine of big thinking, it's probably an overcorrection for older, big-thinking philosophies that kinda sucked.