In the steam marketplace, the developer can change things easily, like changing a super rare card in a collectable card game to a common card.
We already know in game items that affect gameplay basically ruin the game for anyone that isn't a whale. The NFT proponents think they can get everyone emotionally invested like the whales are, but good luck catering to the masses to keep them happy. It's only possible with whales because there aren't many of them and they're the largest source of revenue.
Once you realize that blockchain and NFTs are about charging processing fees for every single event that happens the whole thing looks terrible. Eventually you'll be paying fees to track your items stats, so every time you click or tap it costs money.
NFT doesn't block this at all. Just because an attribute on the token specifies it's rarity, doesn't mean there aren't a gajillion other tokens pointing to the same thing. Or that someone won't just tweak things on the server so that token_url /foo/92 isn't legendary magic beans anymore but common turd burgers instead.