Like others have mentioned, I also plan to use contexts for this purpose, once I get to set up a proper review process. And use "complete" to get them out of the way for now.
There are certain tasks I want out of the way - cancelled or suspended one way or another but this can be for different reasons. Sometimes I just had to rethink it because I got wiser and it becomes a different project or at a much later time. Other times, I didn't make it because I procrastinated and missed the opportunity. That's another thing I'd want to follow up on.