My take on why the WTB&TS has,
On February 21, 2020, the WT Society made the announcement in their website of the release of the New World Translation in modern Hebrew (Hebrew Scriptures - "Tanakh") in Haifa, Israel. Now, the complete NWT is available in modern Hebrew.
In their delusional thinking that they are the mouthpiece for Jehovah to the world in this time of the end.
They think they will fulfill the prophecy of Zechariah Ch.8:20-23
20 ."This is what jehovah of armies has said "it will yet be that peoples and the inhabitants of many cities will come 21. and the inhabitants of one city will certainly go to those of another saying let us earnestly go to those of another saying let us earnestly go to soften the face of jehovah.......
22. And many peoples and mighty nations will actually come to seek Jehovah of armies in Jerusalem........
23. This is what Jehovah of of armies has said It will be in those days that ten men out of all the languages of the nations will take hold yes they will actually take hold of the skirt of a man who is a jew saying we will go with you people for we have heard that God is with you people .
And that my friends is why the WTB&TS have published the whole NWT of the Bible into modern day Hebrew.