It's also irrelevant if LLM's can follow them - the way I use Claude Code is to have it get things roughly working, supply test cases showing where it fails, then review and clean up the code or go additional rounds with more test cases.
That's not much different to how I work with more junior engineers, who are slower and not all that much less error-prone, though the errors are different in character.
If you can't improve coding speed with LLM's, maybe your style of working just isn't amenable to it, or maybe you don't know the tooling well enough - for me it's sped things up significantly.
