Sam2, Redleg: A ? ????? is universally pronounced as a “T” (except for certain people who only ever saw some words without nikkud and never heard them. Don’t laugh, it’s rude.) The variations come in with the tav refuyah. As far as we can tell, most likely it was originally pronounced as the TH in with. Many communities still preserve that version but honestly there are much worse errors to complain about especially in davening like ?? ???? ??? ?????? with a kamatz on the bet.
akuperma: Your argument doesn’t really hold water. It’s almost equivalent to saying “if Hashem was a fanatic about eruvin, then Humash would have included a guide to eruvin.”