[jankins]

I disagree, I think if the OP was attempting to make a fair analysis, he should have acknowledged the third option. My immediate thought was the same expressed in this comment, as My & Your add wordiness. I suppose it depends on the overall tone & genre of the software you're (I'm?) designing, but it's an obvious alternative.

[nswanberg]

Dustin's post was not simply about whether to prepend labels with "my" or "your". That choice was an example of a more fundamental concern: whether to imagine the user as seeing an app as an extension of themselves or as seeing the app as a separate entity, and the implications of that in the interface.

It may have been helpful for the post to consider the effects of using no pronouns on a user's mental model, and a better response to the post would be to explore those effects, not to dismiss it outright as a false dilemma. A much better method of dismissing posts that have obvious answers is to not comment on them.