Good point Wonderment
I think it’s probably worth pointing out that there likely wasn’t just one ancient pronunciation either. Jews in different periods (pre-exilic, post-exilic, Hellenistic) and in different regions (Judah, Samaria, the diaspora) likely had different pronunciations of the divine name. Which one are we calling “original”?
German Jehovah’s Witnesses say the name so it sounds like “yehofa”, which is possibly quite close to an ancient pronunciation of the name. So maybe Jehovah’s Witnesses have got the pronunciation right, just not the English speaking Jehovah’s Witnesses. Why be so English-centric to make the English pronunciation the be all and end all?
I think in some languages they even use forms closer to Yahweh (can anyone confirm that?), which is currently the preferred pronunciation by scholars. So one way or another, Jehovah’s Witnesses have probably got close approximations to ancient pronunciations in some languages at least.