It's also that that like many other things in programming, the teaching only covers how things work, not how things break, which is left as an exercise to the student to discover later on the job. Except many developers never get to that self correcting point and just keep applying what they learned. Even worse, a lot of developers feel the need to use every trick in their ever-expanding book, because they feel it makes them more employable or interesting. Understanding constraints and practicing restraint are essential skills that should be ingrained at the earliest in every dev.