> It seems like the idea of the macro, and more generally of expressing code succinctly, is the closest to obsolete in my memory?

Seems more important than ever? Every model degrades the more context you use, programs that can be described more succinctly will be better made, at least when using LLMs to create these, as it's much easier to fit more "meat" per token.

I'm on the same "S-Expressions taking over is inevitable" but to be fair, I've been on this train for the last decade so maybe I'm slightly biased.