I totally acknowledge that you can find tools that will give you both visions at once and if that's what you feel you need, then by all means you should use them. In my experience though, doing that, you tend to notice the BIG and LONG projects more and you start putting more effort into them then into the other projects/areas of you life and work.
I don't notice BIG and LONG projects anymore than I do projects with fewer NAs. When I open Outlook & Click on a context it ONLY shows me ONE NA for each project. I still process my projects by the 4-Criteria model for choosing NAs:
1. Context
2. Time Available
3. Energy
4. Priority
I Currently have 108 projects and w/ 108 NAs, weighing each one by the 4-Criteria model.
If a Project is an Active one and not in the someday/maybe list, then it means you intend to finish it as soon as possible like all the other ones in the Project List. So most of the time, your better off completing a buch of tasks not related to the same projects so that everything moves smoothly forward. You can always focus on one if it becomes a priority. But as soon as you do, you start loosing perspective on all the others.
Totally agree with you on the previous paragraph.
It's like this old chinese proverb says:
If you look at a Tree (Vertical Focus), your not seeing the Forest (Horizontal Focus).
Big projects will have a number of movable parts so it will be incorporated in the context lists and that project will naturally get done according to size. When you see you have your actions done for your context, you'll probably see you In-box full with the NA of all those you just finished. Time to process
again
I don't have to reprocess my NAs, because as soon as I complete it I date stamp it & move it to the bottom of the list.
On top of that, when I see all the actions for all the projects that I have, I start to feel stressed because I see that I have so much stuff I want to accomplish and that I have so limited time to do them all. This defeats the purpose of getting things out of your mind to work stress free IMHO.