There is a classic article, “Seven thinkers and how they grew: Descartes, Spinoza, Leibniz; Locke, Berkeley, Hume; Kant,” by Bruce Kuklick which tells the historically contingent story of how this list became canonical in America. That is not to say that anyone on the list is unworthy of their status—all of those philosophers are important thinkers who wrote deep, systematic works. But so did Malebranche and Hobbes, and both were exceedingly influential, arguably more so than Berkeley or even Spinoza. So one reason to broaden out is so as not to miss some really good philosophy.
Continuing the End Times series, Richard Marshall interviews Lisa Downing.