We found, especially with Opus and recent claude code that it is better/more precise at reading existing code for figuring out what the current status is than reading specs. It seems (for us) it is less precise at 'comprehending' the spec English than it is the code and that will sometimes reflect in wrong assumptions for new tasks which will result in incorrect implementations of those tasks. So we dropped this. Because of caching, it doesn't seem too bad on the tokens either.