Do you know anyone who bought courses on react-router? The documentation is right there for free.
Wasn't react-training.com owned by the react-router people? I wonder what the training consultants recommended to use for routing...
And what's wrong with that? It works good if you're building an SPA in React.
You asked if react-router team sold courses, they sold consulting services. Seems like a conflict of interest to sell consulting on a tool you built while introducing breaking changes (but hey if you need quick help throw us a few dozen grand).
I guess that's fine for you but it's very smarmy IMO.
They also post (free) documentation how to migrate from the previous major version
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You know you can just read rfc's right? there is a reason they update the thing, because people use it. https://github.com/remix-run/react-router/discussions/catego...
Look at wouter for what is possible if your motivation isn't selling training material. It was written and left alone, it works just as well, it's stable and doesn't change for no reason.