There is value for the person maintaining this library cause they want it that way.
If you develop a useful library and give it away for free then all power to you if you want to rearrange the furniture every 6 months. I'll roll with it.
But if you're trying to help your users and grow your project, I think GP's advice is sound.
But the fact that they made a new release with it undeprecated shows they _do_ care about their users (direct and indirect), and at least from my point of view (both from the Python ecosystem and the browser ecosystem) this was a pretty foreseeable outcome.
That would make it no longer a useful library