Mess might not be the right word, but lots of features are clearly developed without any grand vision or coherent thought about how the features are supposed to work together.
It might be fully automated and eventually the agents figure out all of the bugs, but I suspect the costs are so large that no sane company would ever write code this way, and probably WAAAY more expensive than just hiring humans to write and test it.
Which is what the developer should actually be paying attention to, but I suppose they are just adding features for the sake of adding features.