I noticed that too, but I stuck with him and didn't consider it "going off the rails" so much as just being the typical Siracusa obsessively-detailed critique. Have you ever read one of his reviews of new MacOS X releases? They're agonizingly nitpicky, and the presence of any particular criticism doesn't really imply that this particular detail has as much weight as any other criticism he has. He was clearly reading off of long, detailed notes that he had organized into sections. Still, he does also obsess about how he writes and edits his work, and had he written a review of the biography rather than stepping up to a microphone for a podcast, the thing about PA Semi may not have made the cut. Who knows.
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