It all depends but a 12 week program doesn't make you a Senior Engineer over night. I think these bootcamps provide a nice structure for people who need help figuring out where to start.
A side note, I do know people that were hired right out of Hack Reactor that never programmed before attending.
I feel somewhat conflicted about this blog post. I can agree with what others are saying in the comments that all frameworks have there pitfalls. A lot of development is dealing with trade offs and your teams varying experience.
On the other hand, I agree with the author that there is a tipping point where a framework/tool becomes too much of a burden. Sure, we can all do it the "right way" but teams don't always have people with the experience to even know what the right way is.
We should think about the frameworks we use as tools. Make sure the tool is right for the problem and the team. Also, don't try to apply all your older experience to the new tool. Take time to learn about the thing you use.
A side note, I do know people that were hired right out of Hack Reactor that never programmed before attending.