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If it's intended to be actively maintained, then you probably should understand how things work, unless you want to wipe everything and start from scratch when the LLM creates such a mess that it can't be sorted out.
Agents can't look at a large system holistically, guidelines on .md files only go so far.
That's hardly insane. Not everyone is interested in learning something they want done.
If you do the thing yourself, you know your knowledge limits, you know where the thing lacks. With LLMs, you don't. Maybe it works, maybe it doesn't. You have no idea.
In structural engineering, there probably is no risk tolerance.
In the OP's network or port scan? Perhaps you can get away with verifying a few of the results to get an idea about whether it worked as expected.
I use AI mostly on mobile app side projects, and there QA testing on phone and tablet tells me whether a feature works or not.