To be sure, it is near impossible to document who does and doesn't get fractions. I think it is more importnat to examine the doctrine anyway. The fact that they are allowing fractions now has caused much uprorar on a very sensitive subject, esp to ex JW's, who have had to deal with this thinking for many years....
The fact that medicine is derived from blood, which should be poured out according to JW dogma, creates a theological problem for JW. One could intepret it many ways. But what would their most practical reason be for promoting such a near unexplainable position on fractions, considering their traditional teaching on blood?
The 6 newest and youngest GB members have inherited quite the list of weird beliefs from the old timers, the Knorrites. They obviously were dated and don't stand up to scrutiny. To admit that "we were wrong" on blood is most certainly not an option at this point, because they will get their asses sued. In addition, I am sure that they newer GB are more concerned about the preserving of life then previous generations, just my opinion on that.
So, what to do? Again, please note that the teaching of fractions was heavily promoted after Splane, Lett, Herd and Pierce came on board. They, along with Jackson and Morris most recently, sat in on GB meetings prior to joining, knew what was said, etc. This liberalization of "blood as medicine" is their way of lessening the controversy and trying to save more lives.
Because they can't come out and change the blood teaching for fear of crippling lawsuits, they are splitting hairs on this issue...... The fact that fractions contradict their own interpretation of the blood teaching imo doesn't concern them at all. They are trying to contain a massive forrest fire that the old Knorrite GB started and fanned....
I would hesitate to look for logic where it never existed in the first place. Better to try and understand the reasons behind the decisions and teachings.....