This was a real problem pre-LLM anyway. A popular article from 2012, How Developers Stop Learning[0], coined the term "expert beginner" for developers who displayed moderate competency at typical workflows, e.g. getting a feature to work, without a deeper understanding of lower levels, or a wider high-level view.
Ultimately most developers don't care, they want to collect a paycheck and go home. LLMs don't change this; the dev who randomly adds StackOverflow snippets to "fix" a crash without understanding the root cause was never going to gain a deeper understanding, the same way the dev who blindly copy&pastes from an LLM won't either.
[0] https://daedtech.com/how-developers-stop-learning-rise-of-th...