Just for what it's worth, I think that essay did more damage to discussions on HN than pretty much anything else he's written:
https://hn.algolia.com/?query=http:%2F%2Fwww.paulgraham.com%...
In the overwhelming majority of the cases it's cited, it's used mostly to suck the oxygen out of a discussion, so that rather than discussing the merits of an argument, we're instead required to first resolve the motives of the people making the argument.
I think you should keep declaring your interests in controversies! That's a good thing. I try to do that too. But I'm sure you've seen instances on HN of people litigating this issue and it making for stupid, angry, pointless flame wars. Even if you're very careful about when you deploy this challenge, the rules have to work for the median HN commenter, not just the super careful ones.
Shortly afterwards:
I also think Dan is letting the perfect be the enemy of the good by not updating the guidelines to say this directly and announcing the change --- I know that's because they have bigger plans for the guidelines, but it would save everyone some time to make this incremental change anyways.