For a long time, I thought that the ban on blood transfusions came about because it was an offshoot from the days when vaccinations were banned i.e. they contained blood serum and were considered to be "unclean" and I figured that maybe transfusions were put into this same category.
But I can see from the research presented here that the matter is much more complicated than that. You learn something new everyday.
OrphanCrow, thank you so much for your research.