[mmis1000]

Yes, it's likely react recommend don't do it because to met feature set everyone expect to 'include by default' from bare `react` package today takes way too much effort.

Routing, styling, layout system, animation, data fetching, form validation, i18n, SSR(server side rendering), SSG(static site generation). More and more are expected today. And react by its default offer non of them. And neither react pick a default set that will work by default if you just add them. (Vue or Angular either promote a default set of these or include them by itself, that's a big different with react.)

And integration of library that do these also takes much more time than it used to be because the feature set grows. (Let alone debug why one of combinations didn't work)

Promoting a working default set (A.k.a frameworks) will likely minimize the hassle people need to fight with to get some react app up on the production.

Really, no employer cares about whether you use a react framework or do everything from scratch. If the website isn't online and do what they need. You simply does nothing.