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The problem is that it's not idiot-proof. If someone doesn't understand why the algorithm is important, they might choose none. It's easy to say "they shouldn't be using JWTs if they don't know how to use them", but everyone starts somewhere, and everyone puts stupid bugs into production.

JWT is safe, as long as it's setup correctly, but safe-by-default is a better option.

That being said, I'm not going to swap out my JWTs with PASTs. I know what algorithm I'm using, why I'm using it, it is safe, and I'm verifying them properly.