While not a wrong response in itself, the onboarding cost argument tend to be a bit exaggerated most of the time, because unless you plan on hiring people for a week at most, you're usually better served by avoiding sources of complexity.

The argument is to avoid going all-in on Redux by default if you're doing a React project, not telling you to hand-roll your own Redux.

If you're doing a mostly-static site with a few bells and whistles, then HTML and plain old JS will probably do.