Well I would argue that those are simply reasons why the chosen change is interesting and relevant to the character/concept, but change is still its own justification.
You are right, however, that none of the changes already made or announced are random or unjustified from a story perspective.
The winning formula isn't 'X character as Y superhero'. There are plenty of bad stories starring Steve Rodgers, Peter Parker, Bruce Banner, etc.. The winning formula is good storytelling. Good storytelling means not telling the same types of story about the same characters over and over again.