The best way to have a big picture view of a project is to build a mental model of that project in your head. Coding with LLMs removes that ability, and replaces it with an illusion.
So it really depends on your reviewing ability how maintainable code you will get. It is a bit of effort to review something “you have done” as thoroughly as something a colleague have done. Somehow I still feel sense of ownership even though the LLM did it.
I like reviewing using GitHub’s interface, so I often do a thorough review in that familiar interface while the PR is still draft, and before I have invited others to review. If I review my own code directly in my editor when the agent is done, my brain isn’t in the right context and can get distracted or skip over something.
If so, I don't care if I wrote it by hand or with an LLM. People who think that building something with an LLM somehow dooms the something to mediocrity are engaging in magical thinking. I can simply use as much or as little LLM as will allow me to meet my quality criteria.