You've formed your own arbitrary deadline right there, because what I was trying to say with my admittedly brief and snarky comment is that a feature being "done" is subjective.
You may have terrific business sense, and more importantly, one that is aligned with your stakeholders. That doesn't mean any other developer does. Agreeing on a deadline in many cases of a healthy team practice.
I think that reasonable and technically-informed deadlines are fine. But arbitrary deadlines are not a good long term approach.
We probably agree, but it's difficult to explain everything via comments :)