First, it's always some 'telegram bot' type project where it all starts to break down when they try to add too many features on the existing (buggy) features without understanding what the stupid robot is up to.
Second, they all come to the conclusion they don't want to be 'unpaid project managers' and it's better for the entire world for people to get paid the $100k+ salaries to write crappy javascript.
During the heart of Covid, when the scientific archives were opened for everyone, I downloaded a bunch of stuff and have been working through some of it with the help of Claude. Perhaps surprising to the vibe coders, if you constrain the robots and work through their lack of 'intelligence' they're pretty good at taking the theoretical concepts from paper A, B and C and combining them into a cohesive system which can be implemented as individual modules that work together. I believe there used to be a term of art for this, dunno?
You can also stumble on things which nobody really realized before as the theoreticians from Paper A don't go to the same parties as the theoreticians from Paper B so they don't realize they're working on the same problem using a different 'language' and only when you try to mash them together does the relationship become obvious. Having a semi-useful robot to think through something like this is indispensable as they can search through the vast databanks of human knowledge and be like "no, you're an idiot, everyone knows this" or "yeah, that seems like something new and useful".
So, yeah, horses for courses...