Thank you for your question.
The thought behind revising Murlis as far as I understand, was to avoid using terms which may not be considered “politically correct,” at this time, as well as updating information to a current one.
For instance I recall the one where world population was thought of being 5 billion souls, now it stands at 7-8 billion souls in the Murli.
Revisions may be important for words which may be considered offensive by some. The “worthy” vs. “unworthy,” child comes to mind as well as the “traitor,” labels (may need to be revised;) however, when the figures are “updated” to change the understanding of it; then that is of no use, because now we understand that Brahma Baba had a particular understanding according to his visions at the time. Many times the Murli is portrayed as to reflect the image of an “infallible” God who tells us the “truth,”as if it was a history book; when spirituality is not related with that “book knowledge.”
Sakar Murlis are invaluable for they are the experiences of the founder of the BK clan. Sakar Murlis relate “easy morality,” for the “children” at the time. Sakar Murlis, have a blend of “divine knowledge” with Brahma Baba’s own churnings of the time.
That is all there is to it. Those divine insights is what I like to label “Pure Gyan,” which is the explanation on how everything works in the Drama.