What surprised me the most about PG's essay was his use of tiny small sample size to make a broad statement about an entire field of study. He puts together an interesting argument about the pros and cons of ancient Greek philosophy and their discussion of metaphysics, and includes modern perspectives, but then titles it "How to Do Philosophy". That's akin to writing an essay called "How to do Computer Science", then only discussing the shortcomings of COBOL, FORTRAN, and LISP and concluding that Comp Sci is still a young field and has a long way to go.

Yes, Philosophy is still a young field, but there's at least 2000 years of material not covered in his essay.