it's still going to be worthless if the games servers ever shut down.

Not always the case and there are a few ways the item holds value to the player.

I had a game I was playing that shutdown. It was early access and it happens. The NFTs were in my blockchain wallet not just in that game. I can still trade them on a few different markets on that blockchain. They are now viewed as collector items and they never printed the amount that was expected.

On top of that, if they become worthless or I choose to not sell them. They will be there forever as a memento regardless of the game's servers being shut down for good. If I do sell them my wallet will forever be shown as being an owner at one point in time of that item.

never actually showcased any actual use it is going to have in gaming

This post was never about making such a case as it’s quite an easy one to make. This post is more about dunking on a few people for getting pissy over the word NFT.

As far as the real use case is as follows. A way to verify on public recorded how many items are in existence, who owns them, and that they have not been duplicated exploited into the game. In addition to what wallet created that item and any other metadata that can be collected to determine if foul play was involved in that player acquiring that item.

Diablo 3

As far as D3 went they had a heavy handicap on who was permitted to sell/buy, the amount, and what could be done with those funds afterword's. Many higher-end items were sold on the black market on a fairer playing ground.

NFTs on the other hand if they are real are something that can be sent to a wallet and sold on multiple different exchanges. While the game developer might have an internal market for easy of use if it's not a fair people tend to create create competition and options for the player to sell elsewhere.