Fwiw, we have a stable admin client that uses Formik. One month, I went to update dependencies. Since the admin client was stable, I only updated its deps for minor versions. Four weeks or so later I get a bug report for that client. Nothing obvious or non-obvious jumped out at me in the component of concern and its blame. After git bisecting, it turns out the minor version bump to Formik had a breaking change.

I've only touched that package a few times since but it never fails to make me wish the original lead hadn't used Formik. I dunno, forms in react have never given me tears, but contrary to Formik's slogan it has been painful, even aside from this versioning fiasco, so I'm not sure this endorsement is as strong as you think it may be.