If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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Saying all this without actually seeing the app
I have been trying out systems for a while now. So has Regex and various others.
The introspective thing that I have noticed, and you mentioned here without clearly identifying it is the iterative development of systems. Which is to say that you started on paper, and moved to spreadsheet and after moved to an app (as well as probably several versions of each).
What makes the final version work in the face of potential complexity of starting a new system (and taking a leap) is partly the fact that you lived through the various versions, and know why/how/whatFor different factors have changed to improve the system (such is the pure nature of iterative system development).
HOWEVER by publishing only your final version you only publish the (probably very good) system that you are used to, and not all the intermediate steps that made it possible and necessary to get to here. While I imagine that every possible latest system so far developed by many many various people (Productivity Ninja, GTD, FVP to name a few), will have good features and functionality that are neat of themselves, without the iterative stages, you don't really give people the same final system that you have come to be accustomed to.
What I am saying is; I'd like to see the whole process to how you got here in the hopes of making sense of your successes/failures of systems to do what you want them to do and following that be better able to apply it to my own systems.
On top of that; a dream app would be one that starts as a simple list (like you did), and gradually offers you to add complexity to your system (like you ended up making). But in such a way as to let people progress to the final version when they need//want it.
I will look at the app and get back to you.
I think you're coming on a little strong in ways you don't intend for requesting his process and previous system iterations. This reads as if you should never share any system without also sharing the process of how to get there, and most of the time that is filled with stuff no one really needs to see.