Source: p 232, A Little History of Philosophy (2011 ed; not 2012 Reprint ed.) by Nigel Warburton PhD in Philosophy.
For much of the twentieth century philosophers had lost touch with the great thinkers of the past. Rawls’ Theory of Justice was one of the very few works of political philosophy written in that century that are worth mentioning in the same breath as those by Aristotle, Hobbes, Locke, Rousseau, Hume and Kant.
A novice, I am probably years away from capacitating myself to comment on 20th Century philosophy. So what does the bolded mean exactly? That the 20th Century philosophers became too abstract and theoretical, and not applied or practical? Or worse in quality?