You don't need anything to anything, it's just a theoretical improvement.

No one is hacking your email and stealing the barcode, or figuring out the algorithm and generating fake barcodes. There's no risk that if I sell the barcode to someone else that I also didn't sell it other people as well.

Ticket fraud is huge. (Edit its a multi billion dollar problem)

To then solve those problems you bring in middle men and they charge fees.

Reselling a concert ticket securely (from my perspective, not companies) cost me and the user 5% each. And that's if a service is even offered.

An NFT concert ticket legitimately solves a lot of real problems more efficiently than existing technology.

But ease of use of crypto and transaction fees are still too high to make this a mass market solution. That'll change though.