[Boogieman]

“I know Jews today who do not accept anything other than the first five books.”

That’s hardly the consensus of Jews. Anyway, I don’t really believe that Christians should have to “keep up” with the Jews, but if you say Protestants must “keep up” with changes the Catholics adopt, because the Catholics were the original compilers, then that same logic must be applied by Catholics with regards to the Jews. Be consistent, one way or the other.

[RegulatorCountry]

The peculiar thing is, Catholic partisans believe the Jews only to have been right about their own scripture when they say they're right and not before or after that point, while reserving the ability to expand or contract the canon of Jewish scripture for themselves. Supersessionist belief runs deep and permeates other ares, apparently.

[Natural Law]

"That’s hardly the consensus of Jews."

If by consensus you mean the belief of the majority of Jews, in the several centuries preceding the birth of Christ and the subsequent two centuries the vast majority of Jews were Greek speakers living outside of Israel. Alexandria alone had a larger Jewish population that all of the territory that comprises modern Israel comprised almost exclusively of Greek speakers. For the consensus of the Jews Hebrew was then as it is now, largely a ceremonial language.

Peace be with you.