I think there are sound medical reasons to avoid blood transfusions if at all possible.
In fact, I have a sibling who is an RN and refuses to take blood except under the most desperate of situations. Said sibling is not and never has been a Witness and doesn't like them very much at all. Including their flawed theological reasoning on the subject. That sibling's reasons are pretty much the same for why I stick by the general concept of transfusion avoidance.
Forscher