To Fullofdoubtnow.
You site many examples but many of these if not all of them could be explained.
I agree their has been some left to right and back again on " a few" things. A desire to do the right thing is the motive for such.
One you mention is the understanding of Blood and Blood fractions. Technology and advances in medicine are one contributing factor in this.
The key understandings are not changed. A clearer picture starts to emerge.