One of the interesting setups I saw is using expensive frontier models to write and update markdown for your app: specs, product requirements, architecture, etc

One of the interesting setups I saw is using expensive frontier models to write and update markdown for your app: specs, product requirements, architecture, etc but then use cheap/local model to implement the specs. Markdown is more effective at compressing information and fits the context window easier, than hundreds of source code files but this requires second and third passes, to smooth out the rough edges has anyone tried that?