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In some, but not all projects - it's helpful for me to see actions in the context of what's complete already. Especially because I'm a visual thinker and so the nesting and layout of actions is part of how I structure my thinking about a project and the disappearance of completed actions can mess up a nice layout and ruin my mental map of the project.

In more involved projects I want to keep my completed actions for about a week (review to review) and but for mini-projects and inbox items I want to clear then hourly/daily. Omnifocus only provides a universal sweep - so I end up using taskpaper for projects that are most important to me. Which is really not what I'd like to be doing.