I tried to capture some of my feelings on this on a recent personal blog post/rant. The easiest phrase is that LLMs are "legacy code as a service". They are trained on other people's legacy code. (No one is intentionally feeding LLMs their best proprietary code.) They produce output that is "Day 1 Legacy Code" in the sense that there's no human code owner to take responsibility and you might be able to ask the LLM that built it questions, but it is easier to accept is as the LLM that wrote it is no longer at the company (between context/memory limitations and regular model upgrades/retrainings, etc).

But also, yeah, it starts to get worse than classic legacy code because you could try to build a theory of mind about the legacy code author(s). There were skills in trying to "mind read" a past generation. To find clues in poetry words more than the poetry form. (The variable names and whatever comments may have survived including commit logs; things written for humans to help explain the whys/hows, not just the whats.)