I think "lack of development/enrichment" might be a better term than harm. And "challenge" might not have been a great word-choice of mine, either. Depth? Craft

I think "lack of development/enrichment" might be a better term than harm. And "challenge" might not have been a great word-choice of mine, either. Depth? Craft? Some value. For example, imagine a programmer/software engineer who never, ever, in their entire career, saw good code written by others? Does that lack of good code (and there's lots of ways for code to be "good") harm their development as software devs?