Yeah yeah yeah. I think I see where you’re coming from.So my thought is that once you create your checklists, and they are well organised, you'll start to trust that you can go there once you are doing something that's routine/repeatable. If you look and there isn't one - add a placeholder for a new checklist and a next action to build it out. Over time, I think you'll find that your checklists are an integral part of your GTD system and you won't be sending things in there to disappear!
Is another way of saying this that the habit of being willing to create a checklist for anything that looks like it might repeat functions as the trigger to see if there’s already one there?