HaLeiVi: The Aruch Hashulchan says the same thing. He has a great line in there too. “Chazal are smarter than them.”
Shlishi: The point is that the same potential health benefits that could exist with MBP exist with doing it with a sterile tube. The reason we still do it is because Chazal were Kovea it as a Sakanah and therefore we have to treat it as such even if modern medicine says it isn’t (much like the Tzitz Eliezer’s Shittah on these types of issues).