From what I understand it is simply not useful to expect Bootcampers to have such knowledge. These courses are made to spit people out to the easiest part of the market: start ups and other (small) businesses willing to pay little and receive a lot.

Learning PHP, Python or Java for back-end development is ineffective for Bootcamp courses and bootcampers. They require you to understand programming instead of programming languages, for a quick and functional delivery.

IMHO: It is the role of such companies hiring these people to actually teach them how the "real world" looks like and shape them accordingly.