I take up as many good objections to the idea that philosophy doesn’t matter (it’s dead, it’s without content, its subject matter has been taken over by science, it makes no progress, etc) and then sift through what I think are the best replies. I think some of the objections really do hit home.
In the end, I’m a pluralist about why philosophy matters — I think it matters in a number of different ways, some cosmic, some not. I don’t think it always matters — a great deal depends on the person who reads and thinks about it. The same bit of Aristotle might not matter at all to you the first time you read it, but when you have a real live philosophical problem on your hands, finding an ally in Aristotle can matter a very great deal to you.