Agreed, this is very critical point, I always thought big part of software engineering is the art and science of managing ever-growing complexity.

The part I'm still not sure about is the 2nd point, I just don't know how good those LLMs will get at managing complexity and how important is for human to understand the details of the code. I'm personally not sure yet..I could imagine a future where we have have much more higher level tools to manage the comprehension and complexity challenges. Or it could be that LLMs will never fully comprehend the full architecture and humans will always be needed for that kind of big-picture analysis. I really don't know, and frankly I don't think anybody knows.