I used Milthriljs a few years back. Also created something similar with the goal is to create a "thinnest layer" for building UI.

What I realized is, "who would add something unnecessary anyway?".

I mean developers would think of keeping it as thin as possible. Just that over the time, we run into senarios that need extra codes. Otherwise, users would think about alternative solution. And in web development, it very likely to happen

Hope that you work out the real competitive advantage