"That said, two of our best junior devs (at Arist YC S20) are Lambda School and Ironclad grads respectively, and neither of them had any background in programming and went right from bootcamp into their current positions. So it definitely works for some people."
Some folks thrive in this environment either by natural ability or their learning style and others do not. For whatever the reason the coding bootcamp gets the flack for underperforming folks and it seems to me unfair: Why are they held to this super high standard to teach a difficult subject (computer programming at a high level) to all kinds of learners at all levels?