Chapter 11 of Ray Franz' In Search of Christian Freedom is called "The Misuse of Disfellowshiping." It has a section called "Inflexible Enforcement of Organizational Law." Here's the start of that section:
The manner in which elders apply Watch Tower policies clearly
shows that they do indeed view them as law. The inflexible attitude
produced—or, at the very least, condoned—by the organizational
headquarters causes elders to view neither circumstance, age,
health, years of association, nor any such factor as affecting the
requirement of full compliance with all organizational rules, full
acceptance of all its teachings.
Many members similarly just go along.
I think the above sums it up, no need to be bogged down on the "whys and reasons" It's a plan simple method of "CONTROL" over the general R&F JW population. Look, the Scientologists, do the SAME thing. It's a way to get all your ROBOTS working and fearing the in the EXACT same manner. And if you do not "tow the line" with the WTBTS on the same EVERCHANGING ideas, you can be Gone gone gone and there is nothing you can do.
So you have to ask yourself, if JESUS was running the WTBTS, would he act in such a TOTALITARIAN manner? Heck no, he would not. This type of action(s) - D'a or D'f ing does not come from the 1st Century, but comes from early PRotestant religions from only a few years ago. It's like the old saying. "if you aren't for me, your are against me". Purley created for CONTROL
And the "ME" being the New and improved FDS.
Just think about it - Mind Control, a pleasant way to start your day,
Now go out and make something good happen!