The scholarly position would have been to draw attention to the role that Michael the archangel plays in Scripture without being dogmatic about who he is. I think some of the reasoning is probably valid. The role that Michael plays lends itself to the same role that Christ plays. The mistake is to make it dogma within the belief system of Jehovah's Witnesses.
The same would hold true for other teachings of the Watchtower Society including that on blood. It should have presented its material based upon Scriptures and even its opinion about them. But the decision should have been left entirely to the consciences of its members.
There are many things in the Bible that do not have conclusive answers. That is why there are so many denominations. But Christians don't have to conform to the same doctrines to be unified in their central belief in Jesus Christ.