1. You misunderstand how NFTs work. They are proof, because anything on the blockchain can be easily traced back to the original distributor, which in this case would be the university. Thats why it's called a blockCHAIN -- you can easily follow the chain of blocks. What do you think the school is going to do if you contact them? Check their database. The blockchain is no different. It's a public database, which obviates the need to call the school to ask them to check their non-public database.

2. None of these things have digital ownership enabled, none are part of a global publicly accessible API that others can connect to, none are part of a market where they can be bought/sold/traded. So all would be better with NFTs.

3. You haven't given a single reason why GameX would care to ban PlayerA just because Blizzard banned them. We see the opposite online all the time: people getting kicked off of one social network while be allowed to operate on others.

4. All of your examples here once again misunderstand how NFTs and the blockchain work, just like with #1 above. With IDs, the central authority that granted you the "21 years old" NFT would be listed as its origin on the blockchain, which obviates the need to check with them.

Anyway, at this point discussion is futile. You don't understand the technical details of how the blockchain works, and the rest of your points are just negative predictions of the future in the vein of, "This is how things work today, therefore this is how things must always work." It's very similar to people in the 90s claiming that no serious company would ever put anything on the internet.

Come back to these comments in a year or two.