Halcon:
I predict birthdays, mother's Day and Father's Day will be next. The blood thing is tricky bc there is explicit rules on it in the scriptures.
If I recall correctly the explicit rules in the OT were against partaking in blood for nourishment, as was the case in groups other than the Hebrews. I can still see that being a thing, making sure that your sausage doesn't contain any "meat by-products", which (in the 70s) was my job when going food shopping with my mom.
Blood transfusion as a medical treatment, though, is not - as former WT Publications™ falsely stated - a nutritional thing, and as such, cannot be interpreted to be a practice that is prohibited in the bible.
When your blood volume is severely and/or decreased (as in a trauma like a GSW or MVA, or a postpartum hemorrhage), you will die if you are not replenished. Also even if you survive, the loss of red blood cells takes a long time to naturally return to the level it was before the blood loss occurred. You need the red blood cells to feed the the body from the inside, providing oxygen, removing carbon dioxide and other waste materials, sometimes with the help of the lungs, other times with the digestive system. The brain cannot function properly with oxygen saturations below normal levels (92-100%); we can adapt and survive, but we can't thrive the way we should.
When a woman has a postpartum haemorrhage and her hemoglobin level drops to 70-80% of what is normal, she won't be able to produce milk for her newborn, because her body is severely occupied with keeping her alive. It can take months to recover from that. (been there, done that)
If anything, the GB can use the example of David pouring out water that his men had risked their lives for to acquire on David's behalf, as if the water was a blood sacrifice, to show the value of blood - what is now a very renewable resource in the field of medicine - to save lives. Ecclesiastes 9:4 "a live dog is better than a dead lion" conveys the meaning that it is always better to live when you have an option to keep yourself alive.
In the How Blood Can Save Your Life booklet, they came up with some cockamamy rationale that because Jesus gave his life for others, that JWs can only respect that sacrifice by being willing to sacrifice themselves in the face of death. It's just another lame control tactic by men in suits. I'd be willing to pay for a ringside seat when (not "if") a class action lawsuit for wrongful deaths happens brought forward by people who lost loved ones for coerced (or else DF) refusal of blood transfusions. The number of deaths around the world probably outnumber those of Jonestown by at least a factor of 20.