I agree with your point about the dangers of right/wrong thinking, though when I wrote that line I was specifically thinking about people who say we should never test private methods vs people we say we should always test private methods, in which case they truly can't both be right. I've updated the post to make that clearer.

On your point about language limitations, I also wonder about this. I vaguely recall coming across a post that mentioned testing private methods just wasn't an option in various languages in the early days, and it's possible that were that not the case, we wouldn't have so many advocates of the never-test-directly viewpoint. That's not to say that the viewpoint is wrong though.