Political decisions are never simplistic. They always have many layers of issues and often create strange alliances. Henry VIII would need alliances if he were to go against the Pope. The national and international alliances were ready made by Luther’s influence throughout the world and within England. In addition, by nationalizing the Church he could tap into the RC Church’s wealth and influence.
Upon Henry VIII’s death the Church came back under the Pope because of his sister Mary who succeeded to the throne.
Finally, it was Queen Elizabeth I who made England a protestant nation after Queen Mary.
So, the simple version of the truth is it was Queen Elizabeth not Henry VIII who separated the Anglican Church from Rome.
Political decisions are almost always simplistic. It was in Henry’s perceived best interest to do what he wanted to do so he did it.
It is as simple as that.