I totally agree, I think the usage rules files probably serve as some of the best quick reference we have now even for humans. Should probably put these into the hexdocs even 
As for whether we’ve entered the world of “disposable code”, maybe but I think not 
If you can have a recipe for building applications that stand the test of time and can be done at the speed of an LLM, then you’ll really be on top.
Early experimentation with a combined rules file leads to massive improvements in output of LLMs, and that is just with the ash ones not one for elixir, LiveView, etc.
Plus Claude 4 just came out which appears to have finally indexed some Ash stuff
