I have been dealing with this type of feedback for almost 20 years at this point: "This library doesn't work for my needs, so the conclusion is that it is hobby/not useful/etc for everyone". In your experience, we are not there yet (and we may never be), but the generalization does not hold.
Take Explorer, it was the first library of the bunch to be used in production because it was created by Chris Grainger to write data pipelines at his company. And the blog post does include the link to a talk on production usage.
Other projects, like Nx, started as an experiment, but nowadays it is used in production quite a bit and we spend a lot of the time refining it based on feedback we receive.
No one is claiming those libraries are complete. It is still pre-1.0. But we claim to be evolving and improving based on feedback. So if anyone wants to try something different than Python, and you can afford to engage, give feedback to maintainers, and even contribute, then you will hopefully have a good time and be closer to running it in production too.