I think that's a big win. With React, you can see the use for functional concepts without having to switch to a functional programming language, or completely divest your codebase of 'friendly' object oriented techniques like class structure and subclassing.

Similarly, I'd give a shout to MobX for showing me how observables can be used in practice. For the longest time I'd wanted to learn it, but I'd choke on the syntax and the generality of common libraries. Showing how MobX worked to simplify React code, gave an instant sense of success and things clicked afterwards.