I happily got rid of a legacy application (lost the pitch, another agency now must deal with the shit) I inherited as a somewhat technically savvy person about a year ago.
It was built by real people. Not a single line of AI slop in it. It was the most fragile crap I had ever the misfortune to witness. Even in my wildest vibe coding a prototype moments I was not able to get the AI to produce that amount of anti patterns, bad shit and code that would have had Hitchcock running.
I think we would be shocked to see what kind of human slop out there is running in production. The scale might change, but at least in this example, if I had rebuilt the app purely by vibe coding the code quality and the security of the code would actually have improved. Even with the lowest vibe coding effort thinkable.
I am not in any way condoning (is this the right word) bad practices, or shipping vibe code into prod without very, very thorough review. Far from it. I am just trying to provide a counter point to the narrative, that at least in the medium sized business I got to know in my time consulting/working in agencies, I have seen quite a metric ton of slop, that would make coding agents shiver.