Personally I don't care about the rewards. If I'm playing a tough game or a higher difficulty it's more about the sense of accomplishment that comes from finally overcoming the challenge. That being said, some people don't get their dopamine from that sort of thing so I totally think more difficulty options is always a good thing.
That is an act of cruelty towards the poor pokémon ( pawb.social ) Englisch
Game difficulty ( imgchest.com ) Englisch