Tried to improve the "Status of this Document" section.

The text change is there so it can be used both in the TTWG FPWD and TTCG
specifications.
The point that I am trying to make is that you shouldn't be trying to implement new features if you still have gaps in your implementation. *all features* is the key in that sentence above and why there is a "then" in the second sentence. You're argument makes sense, too, but I'd like to say something about completeness of an implementation for conformance.