Absolutely - trying to teach people who are not interested in learning requires a very special set of skills, motivation, and personality that few have IMO. It certainly demoralized me as my university teaching responsibilities gradually shifted from small graduate research seminars to overcrowded introductory undergrad surveys, and now in tech roles I make sure to push back whenever my job devolves too far into babysitting. Smart, motivated junior devs are a true pleasure to work with, but unfortunately are still the exception rather than the rule.