The idioms and phrasing of the KJV just does not communicate Scriptural meanings accurately to minds rather locked into modern English idioms, constructs, reality.
This is a linguistic, psychological, cultural, brain structure reality.
Personally, I was reared on the KJV. In high school and even college, I actually literally slept with my Dakes KJV as a teddy bear. I wore two Dake's out. My memory work is virtually all KJV. I love it. But I was reared on it for at least 18 years. I learned it from age 1 or 2 in Sunday School. I can translate the KJV into more or less accurate meaning, for me.
That is just not true for youth and especially ESL people of today. They will not go through the hard work of trying to make sense out of an archiac language. One can rationalize and dance around it and worship it. But KJV is written in an archaic language.
Jesus was thoughtful enough, loving enough and wise enough that he did not speak an archiac language to His earthly listeners. He spoke the very common language of the day.
I consider it idolatry, arrogance, fossilized rigidity and insensitivity to the needs of the lost to elevate KJV to an object of idol worship to the loss of more effective Evangelism with the lost of the world.
I don't think Christ will treat that kindly at the judgement seat of Christ.