OmniFocus is the only Mac GTD application listed on the Software page at the David Allen Company website, and Davidco has put out a white paper on using OmniFocus. Said white paper opens with this quotation:
Quote:
“OmniFocus is a stellar tool for keeping track of outcomes and actions in the Mac environment. It supports simple but important practices for keeping your head clear, staying focused, and managing your commitments.”
– David Allen
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It must have somehow escaped DA's attention that OmniFocus is not fully GTD compliant, as you assert :-)
As for the improvements you suggest,
1) multiple contexts is something that is a popular request, but when push comes to shove, just isn't needed for the vast majority
2) extension of the status model to allow individual actions on hold is slated for OF 2 (and like #1, really isn't mandatory for most GTD practice)
3) your inbox problem was fixed almost two months ago in the sneaky peek builds (and someone who espouses "proper" GTD should be processing the inbox in first-in, first-out order, as DA writes in the first of the processing guidelines on p. 122 of Getting Things Done!)
I think you greatly underestimate the amount of effort required to build a system that would be a strong competitor to OmniFocus, much less surpass it. The Omni staff have demonstrated time and again that they have a good feel for which features the buying public wants and needs and which features are of interest primarily to a noisy but small group of people. Just as importantly, they've built a very strong support organization, and they do listen, notably better than much of their competition, I think.