Yeah moving items across games would be impossible at the moment. But I feel that with nft’s, you at least get to own the item. That, and people get to make their own. It’s not easy to add your own skin to Fortnite, for example.
I don’t want to sound like I’m for NFT’s, but I think if done right, it has a usecase.
I actually like Flatpaks… I use dpkg/apt-get for system packages that cannot be installed in userspace, and flatpaks for desktop apps / games. Many distro’s have unified ways to update them anyway (at least VanillaOS has)