KJV onlyism is a shallow, fragile view of the power of the Holy Spirit to teach, though it is understandable for shallow Christians who still think that they have to figure out the bible with no divine guidance.
Living out Christianity helps bible understanding, and then in turn better bible understanding helps Christian living, in a reinforcing process driven by the Holy Spirit.
Consider that Christians did quite well with the Septuagint, which is sometimes loose and liberal with the Old Testament language.
Any conscientiously produced translation is adequate for the purposes of the Holy Spirit to teach.