I don't disagree but we ended up with systems like Jinja because that's what people adopted. I also built GHRML which was a syntax aware template engine for ge

I don't disagree but we ended up with systems like Jinja because that's what people adopted. I also built GHRML which was a syntax aware template engine for generating XHTML documents and it never really took off. Sometimes it's the simple and dumb solutions that win out over the cleaner stuff. Nowadays maybe less so, JSX clearly won and if you build UIs today that's probably what you should go for. However there were many solutions like JSX a long time before and somehow the value proposition was not right for the software written at the time.