Yeah I get you. I understand the use case of "We just need to ship something for a client now", I've been there plenty myself and C-R-A solves a real problem (as well as it being useful for experienced devs etc).
But as far as learning goes, I really think it's critical to learn what the components you are using do. Otherwise, you have react, and a black box you don't understand next to it.
That's fine. When you want to learn what's in the black box you can dig into it. The key is unblocking people on their path to their initial goal (eg. learn React) so they don't give up after getting stuck on a prerequisite (learn to configure webpack, learn to configure babel).
But as far as learning goes, I really think it's critical to learn what the components you are using do. Otherwise, you have react, and a black box you don't understand next to it.