My guess is that it's because most of us don't have someone's life in the balance? Whatever damage you do to a computer when learning, it probably isn't permanent (screwed up sshd? changed file permissions and you don't know how to fix it? either rollback the VM or create a new one!).

Most new webdevs do really basic things which are more akin to them being receptionists anyway (I've seen tickets as ridiculous as "change this while loop to a for loop", "add this css class to this button", etc.). And let's face it, most people who learn programming in 6 months are probably not doing anything more complicated than web dev, with near-zero knowledge of devops (disclaimer: I too know very little of devops)