For example: A few days ago I saw a quote that over 90% of current Y-Combinator startups vibecode their products. The problem is the author misunderstands context: Startups sacrifice quality for time to market. In other cases, if you're building something that isn't technically challenging, (because it's 80% similar to many other products out there,) you can probably vibecode it.
In contrast, if you're doing something technically challenging, it's to your benefit to be a lot more hands-on. I recently started getting excellent reviews from copilot of my hand-written code. (Or, I should say, the hand-written parts of an AI-assisted pull request.)
On the other hand, some things are incredibly product intensive and poorly defined and it seems LLMs will latch on to an arbitrary direction with much lower success rate.
It is also worse in "brown field" where there's lots of tribal knowledge and technical debt. Two systems may both exist that look very similar but oftentimes there's the one on life support that almost no one uses or cares about and the LLM doesn't know it should largely ignore that until it's thoroughly documented (which can be a significant undertaking)