I think the largest failure is bad architecture, or that is the inability to understand architecture at all. After your vibe coded project gets larger than a prototype and you “zoom out” to try and grasp what is going on, is when you see how bad it is.
They said it can write code. They never said it can fix code or debug issues.
That’s like saying you can drive, bit can’t navigate or park.
I think the largest failure is bad architecture, or that is the inability to understand architecture at all. After your vibe coded project gets larger than a prototype and you “zoom out” to try and grasp what is going on, is when you see how bad it is.