The best analogy I think is, if you just take Stack Overflow code solutions, smoosh over your code and hit compile / build, and move on without ever looking at "why it works" you're really not using your skills to the best of your ability, and it could introduce bugs you didn't expect, or completely unnecessary dependencies. With Stack Overflow you can have other people pointing out the issues with the accepted answer and giving you better options.

This keeps coming up again and again and again, but like how many times were you able to copy paste SO solution wholesale and just have it work? Other than for THE most simple cases (usually CSS) there would always have to be some understanding involved. Of course you don't always learn deeply every time, but the whole "copy paste off of stackoverflow" was always an exaggeration that is being used in seeming earnest.