Except wire up routing in a strange way, or pick a library for form validation or form framework, or come up with odd ways of structuring tests, picking a strange approach for animations, etc.

This is the cost when app architecture gets delegated to your developers over a high quality central solution, the quality is as good as your developers.

> If you stick to prop drilling and functional code

Juniors new to React are unlikely to do so, IME (as a semi-new-to-React not-junior working on a team with new-to-React junior-ish devs -- by experience; there isn't a formal junior/not-junior distinction on our team.)

OTOH, if you do things you really shouldn't do in React, while they won't all be flagged, there's a very high probability it will result in at least related warnings pointing to it in the devtools console, so that's something.