> If we ignore the fact that established libraries are incredibly stable, tested by hundreds of thousands of developers, included in thousands of CI pipelines and maintained by experts on the topic...

That last fragment. I fear increasingly less so. There's already been a number of posts pointing out that modern programming is often held up be a few key individuals. And now (some of) those individuals (Linus, people like Chris McCord of LiveView, etc), are sharing how they're now "doing more of the stuff they've always wanted to do", and offloading tedious stuff to AI tools (by the way, expertise comes through tedious reps).