In contributing to open source software at scale I'm teaching apprentices. I expect them to adapt what I've done to their own purposes, and have seen a good amount of that out in the wild, often people who ended up doing something entirely different like building hardware that also contains software.

I don't think LLMs will be able to pick up on what's done by an evolving and growing codebase with previous projects also included. More likely it will draw from older stuff and combine it with other people's more normal stuff and end up with an incoherent mess that won't compile. Not all work is 'come up with the correct answer to the problem, and then everybody uses it forever'.