> ...than the people building production-grade web apps...
Please don't co-opt the word "production" to mean what you're implying here. Production doesn't mean single-page, reactive, etc. applications, it just means "in production."
I agree. My workplace has at least a dozen applications deployed to production with "just JS" and they're just at production ready as a react stack would be.
Source: Running "just JS" in production for more than 6 years.
