It is not hatred, it is more of a pity. JWT is abused in places where it shouldn’t be used as stateless tokens aren’t suitable for general purpose authentication. Also JWT just done poor choices from the security viewpoint. It is much better to use versioned and fixed set of small, proven, and chosen by experts, algorithms than to allow everyone to pick their own, as in the end it can cause leakages. PASETO for stateless tokens (when needed) is much better. However for general purpose authentication over HTTP it is much better to use sessions with good old signed cookies (especially if marked as http-only cookies).

In general - when used properly, JWT isn’t that bad, but there are better options for such uses anyway.

No idea. I do not use Guardian at all.