"And it's just plain better at writing code than 60% of my graduating class was back in the day".

Only because it has access to vast amount of sample code to draw a re-combine parts. Did You ever considered emerging technologies, like new languages or frameworks that may be a much better suited for You area but they are new, thus there is no codebase for LLM to draw from?

I'm starting to think about a risk of technological stagnation in many areas.