Hm. Some have rather a lot of experience of making such mess themself.

I mean for real, is the idea here, that all programmers are or were some kind of semi gods?

Because this is not what I remember from the pre LLM time, rather this:

https://xkcd.com/2030/

I know I got into such developement hell myself. Fix a bug here, results in braking something there. Experience surely helps in avoiding it .. but even senior devs can make a mess. Otherwise there wouldn't be so many projects canceled.

So sure, agents can multiply a mess in a amazingly short time, but .. that is up to the humans guiding them.