Yes, there exist situations where periferal-to-periferal is faster than RAM-to-periferal. But that doesn't make the disk access optimizations on your OS harmfu

Yes, there exist situations where periferal-to-periferal is faster than RAM-to-periferal. But that doesn't make the disk access optimizations on your OS harmful, nor even useless. The disk-to-CPU access is best done through those optimizations for several reasons, one of them being that the author's conclusion isn't entirely supported by the data.