You pretend as if the Masoretic Text was just copied from an older Hebrew manuscript like a copy machine.
It literally took centuries of reconstruction through many debates between many schools, each having their own unique codex, some influence from the targums, midrash, talmudic writings, Rabbanic paraphrasing, various alternative versions of proto Masoretic oral transmissions and text, creating many independent bumbling interpretations throughout many many locations to form what is known as the "received text"
It is not a witness to any complete Hebrew Text unlike the many Greek witnesses to ONE earlier Hebrew Text- a Parent Text of the Greek translations and to the many versions of differing paraphrased proto Masoretic Hebrew that formed the Masoretic.
Ask any Rabbi! the Hebrew was lost and had to be reconstructed, in fact if you knew modern Hebrew and had to read pre-masorei hebrew scripts you would spend your lifetime learning how to interpret it, it took them centuries to come up with the marking system to understand the Hebrew... the Greek translated the Hebrew into a major language, making it easier to translate further as languages grew and spread into diverse languages.