For a counter example, I'll say that we've got 3 Bootcamp graduates on our team at work and they've all been very good. They've all moved into languages beyond what they learned in their courses. One has become a major platform contributor and has been a driving force in decisions being made. Another has been working with hardware and system deployment. They're all very driven, I've been quite impressed.

Now the caveat to my statements there are that all three already had degrees, in disparate fields unrelated to CS/CE. It's an example of capable individuals being able to learn practical skills in anything.