Reasoning Behind This Major Move
Well, the move is not due to disagreements or separations between the brothers. rather the move is due to Harry’s concern for his wife’s safety. The press have been targetting Meghan and acting out of line with regards to their life, having a negative impact on her health and well-being. Thus, the step out of the public eye is Harry speaking up in support of his wife and her stability. The royal family, of course, backs their choice due to these reasons.

Reasoning Behind This Major Move
Baby Archie’s Title
Additionally, Meghan and William chose to have Archie not be granted a title just yet. The pair want Archie to have some sense of normalcy and choose whether he wants the title or not. For now, he is known as Master Archie and can be given the title of Prince in the future if he chooses so. this was not an attempt of any kind of favoritism, simply his parents’ choice.