It's all a Catch-22 for WTS.
1) -- If they stop shunning, that means JWs talk with their "apostate" family members. Talking means trying to understand WHY they left. Understanding why they left means they come to understand TTATT. Understanding TTATT means more members gone. That's why shunning works. Information Control.
2) -- It messes up the Numbers Game. Yes, they could rationalize the 50% one-time loss as a "sifting out" of wicked or weak. However, the supposed reason for the delay is so that more can be saved. If growth stops or falters, then how do they explain why Jehovah is delaying? This is why children are being baptized -- to keep up the excitement for growth. Also, even weak members who only attend once per year, can give money. Often this may be guilt-driven, but it's still money.
4) -- Door2door keeps them BUSY. It makes them feel important and involved. It also gives status to those who do more such as pioneer. Many JWs have no other way to have any status in life. They are poor, uneducated, and odd. As are their kids. Thus, pioneering and having all of their kids pioneer (or go to Bethel -- most are kinda odd there too) gives them status.
5) -- Education will not mean more financially successful JWs who can donate. It will be LESS JWs and less donations. This is why they FEAR education. It can't keep them dumb and down on the farm if you send them off to school. Reality is, they will leave (the religion) and never return.
6) -- Spot on. Blood is already transitioning to a conscience matter. Must step cautiously here so as to avoid lawsuits from all the past deaths.
Doc