...it is not in the public's interest to have this knowledge widely known before negotiations."
Why not? This is actually a serious question. I get that revealing our negotiating position too early might put us at a disadvantage in some cases but I see that approach as being rather combative in tone, trying to secure every advantage possible against some rival, which is really what I'm asking. Have we really come to see the EU as rivals to be fought as hard as possible over the negotiating table?
It's the approach behind all this secrecy that I find counterproductive (and that's even before it's so obviously undemocratic). The "170 questions" thing is a gimmick (170 days to go until the deadline for Article 50 triggering, by the way, OG), but I don't see why clarity on certain key issues should be so damaging, if not now then certainly before the two-year period starts.
If nothing else, I hope that the consultation that goes behind deciding the answers to (some of) these questions is a reasonably open process, as opposed to being decided by just a handful of people.