“One thing is certain: no one speaks the 17th century version of British English found in KJV.”
There is another thing also for certain: literally of millions and millions of believers worldwide still sat with an open copy of that 17th century English Bible in their lap this Sunday, and benefited, and grew, and worshipped. I will testify that that 17th century Book still gets the job done today, just as it did in years prior to 1940, when virtually all non-Catholic preachers had that text in their pulpits.
It's not a rule. It's a fact that no one speaks 17th century English. Language is a communication tool. If we are going to communicateespecially siritual issuesit make sense to do so in the contemporary spoken language.
Othwewise it might as well be be in Klingon.