As long as it's flagged "Show HN", it's all good. You shouldn't be taking it more seriously than it is. I bet you don't have the same response when someone posts some other pet project of bouncing balls in WebGL and WASM Rust or something.

I've been working as a frontend developer most of my life, so I see what you're saying. Still, it's a just a fun thing to do. I've made some hobby libraries myself with no intention of it "catching on". And even if it's reinventing the wheel, perhaps one of the spokes is improved .