> I've spent decades building up and accumulating expert knowledge and now that has been massively devalued.

That remains to be seen. There's a huge difference between an experienced engineer using LLMs in a controlled way, reviewing their code, verifying security, and making sure the architecture makes sense, and a random person vibecoding a little app - at least for now.

Maybe that will change in a year or two or five or never, but today LLMs don't devalue expert knowledge. If anything, LLMs allow expert programmers to increase productivity at the same level of quality, which makes them even more valuable compared to entry-level programmers than they were before.