Is software ever really done, as long as it's not perfect (and perfection does not exist)? In fact, even Moment.js is not done. They say they will keep releasing security fixes and time zone updates. What if at some point they decide they won't even do that?

I am wary to use software that is not maintained, because bugs won't get fixed, and new requirements that will eventually arise won't get taken up. And usually at that point a competitor rises up and releases a better product.