This is off topic and will probably be spun on me again for daring to try and explain. But, yes, those things are indeed worthless to you. When developing a game though, you have to make decisions on what to add and how large the amount of players that would play such a feature and what effect it would have in the games lifespan is, cause you have limited resources. So, your resources should go to the features that most players will make use of or that will benefit the tail end life of the game. I think that in the terms on new game +, it might have been less clear what people really wanted from it. Many have different ideas of what the feature should be and it has not come to the expectation of all. It does NOT mean they don't care about story. It means they care about more than just the story.
So, please let's try to move from that misrepresentation. You can like more than one thing. New game + doesn't have to be only the bare minimum for only those that want to replay the story with nothing else. If something simple like giving xp is gonna interest more players into using the feature, why should one tell them off? How is the feature gonna lose anything from it? Same goes for achievements or difficulty levels or challenges, etc. Let's try to think less in tribalist terms and more in how we can include as many people as possible.
Also because there are other things, doesn't mean there can't be more.