You're saying that the name is important, but not it's correct pronunciation... That doesn't make much sense to me. Why give the example in Ruth, where they vocalize the correct pronunciation of the name to one another, if it isn't important? How many variations exist between the four letters of the tetragrammaton? If everyone spoke their own variant of the name it would sound as if a variety of names were being spoken.
God's name is not in a pronunciation, or a spelling, it is in action. If you knew this, you would not even be able to take God's name in vain-- but demanding that everyone know and call on the tetragrammaton without its vocalization has proven itself vain. The fact that the eternal God allowed the pronunciation of His name to dissolve says something to me; it was being used in vain. The fact that Jesus did not reinstate, or use the tetragrammaton, solidifies this.
Why then, use Jesus name, or Jeremiah's, or countless other names that we have lost the ancient Hebrew pronunciation for?
God's Name is pronounced somewhat differently in different languages. The Spanish do not say Jehovah exactly as do those who speak English, but there is no doubt they are speaking of the same true God. What is really important, IMO, is to know the Person identified by that unique Name. That is why Jehovah has had his Name so prominently mentioned in the Holy Scriptures.
The facts show Jesus did use and honor God's name. He it was who told us to pray to God; "Let your Name be sanctified"', and who said in prayer to God;"I have made your name manifest to the men whom you gave me out of the world. " (John 17:6)