The majority of people I have seen complaining about Javascript fatigue do it from the peanut gallery. If you are a Javascript developer: you shouldn't have javascript fatigue unless you chase after the latest and greatest - which you shouldn't do. If you do not experience have "cereal fatigue" at the supermarket, you shouldn't get Javascript fatigue either.
It took me all of 30 seconds to skim the home page and to conclude "hmm, I don't need this now", but I've filed it at the back of my mind should I require it some day (I might not remember the name then, but I'll be able to figure out the search keywords).
> We need to stop fragmenting and start doubling down on existing libraries.
I reject this sentiment. You can't force people to contribute to projects they have no passion for. You also can't prevent people from scratching their own itch and registering a domain for their slightly different flavor-of-the-week JS project. Best you can do is ignore them or support them. The undeserving will wither eventually, you do not owe any project your attention.