This is a really touchy subject for both people who have attended a boot camp and those who are considering a boot camp. Some coding boot camps are...
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I am a curriculum developer for Tech Elevator and we are a 14-week Coding Bootcamp. I would agree with a lot of what you said here but I want to add something to it. One of the biggest advantages of bootcamps is going through this journey with people who probably have similar backgrounds to you. When you can talk to fellow students who are struggling just like you and talk to past students who were in your same shoes it doesn't make the journey seem impossible. It is certainly not easy but what awaits you on the other side is certainly worth it. Thanks for sharing your thoughts!
People would be lucky to be proficient in 1 programming language in that time frame. I guess that depends upon how one defines the word proficient.
I've never seen a coding bootcamp of that length of time claim you'll become proficient in 3-5 languages. I've never even seen any that cover more than a single main language (Java, .NET, etc).
Nice summary though. I've never been through a bootcamp -- they didn't exist when I got into this field, but I am self-taught. There is a local bootcamp that I support and have participated in mock interviews, career panels, meet & greets, and other such things because I believe in what they're doing.