That solves some problems, but not all. Games in the same engine can have totally different mechanics. Imagine an item that doubles the speed at which your health regenerates. Well, what happens if you use it in a game that doesn't have automatic health regeneration? It could just ignore that value, or should it double the effects of health packs instead?
Also, plenty of games use totally different scales for things. +10 to damage might be a huge benefit in one game, but a tiny benefit in another. The NFT could publish a value like "here's what the max value of the stat is in the original game" so other games could make it proportional, but stats might not necessarily have a max value.
Basically it seems like the only reasonable way to do this is for game developers to cooperate in some way, and if cooperation between devs is needed, the value of using a blockchain instead of a database + API goes away.
Also, plenty of games use totally different scales for things. +10 to damage might be a huge benefit in one game, but a tiny benefit in another. The NFT could publish a value like "here's what the max value of the stat is in the original game" so other games could make it proportional, but stats might not necessarily have a max value.
Basically it seems like the only reasonable way to do this is for game developers to cooperate in some way, and if cooperation between devs is needed, the value of using a blockchain instead of a database + API goes away.