When will mithril.js get the hype it deserves, I'm a sucker for simple tiny libraries with no dependencies and no build steps that are mature as well (6 years). I guess it doesn't have a flashy community with talks and developer advocates :/. I feel the same about htmx, another simple tiny library with no deps and no build steps. Why don't people recognize the advantage in that.
Needing a separate build step is not the hindrance that you think it is. For most developers it's a "set up once and forget" thing, and there are many cases when you would need to transform code during build anyway.
Because bell curve. Mediocre developers are the curve and they evaluate tech differently. When most developers evaluate tech based on engineering metrics alone, we would make progress a lot faster. (The business benefit automatically comes with the curve).