I don't think you misunderstood - a
previous post sums up what we see as the downside of introducing tagging. Specifically, it takes your "I can do this" lists and turns them into "I might be able to do this" lists.
Fundamentally, we view "showing things you can't actually do" as undesirable, so we don't want to introduce that tradeoff into the app. We do feel like we have a good understanding of people's desire for more flexibility in organizing their tasks, and we plan to service that underlying desire in the future.
In the meantime, even with a single-context approach, we haven't encountered any situations that OmniFocus truly can't handle with existing features. (Hierarchical contexts, due dates, and so forth.) My posts on
this page may be helpful, and if there are areas of your workflow you're struggling with in OmniFocus, we're happy to help.
Of course, reasonable people can disagree about any of the above - my goal here isn't to persuade you that our way of thinking is correct. Just to offer information and/or help.