Couple of points:
1. I'm not certain you understand how representative government works. You vote for a person, they do what they believe is in your best interest - and whatever they do must be in your best interest, because you voted for them. Do you want your representatives to send you notice of what they do every day?
Why can't the document be negotiated in secret, if EVERY piece of it is made public before it is signed into law by your government. Other than your 'need' for information, what is the purpose of requiring every step be made public?
2. You don't seem to understand how negotiations work.
It's (relatively) easy to negotiate on behalf of 300 million people. It's impossible to negotiate when a majority of the 300 million "want to know what's going on". What you believe is in your best interest isn't what Jim in Texas believes is in his best interest. What I believe is best for all of us isn't want you believe is best for all of us. A middle ground, based on experience and research is the starting point for any economic negotiations. Experts in the field are used (although we could debate how to define expert, and how to ensure they don't have any conflicts of interest).
You know what kills any negotiation? If one party is seen to be unable to make decisions for the group they represent. What both sides want is to know the other person at the table is able to say yes and no, with relatively strong assurance the decisions will be held in the future, or changed in ways that will still be acceptable.
You know what happens if every step of a negotiation this large is public at every point? Fox News, CNBC, and the like let their screaming head commentators loose on it, thereby undermining the appearance of negotiator authority - REGARDLESS of the actual content of the document. There are people, public, famous people, who make a living by complaining just for the sake of it - and they have a lot of fans.
With this many people involved, there will be loud voices of dissent on every.single.point.
Anyway, what is the difference between you knowing that on Tuesday we agreed to weaken X, in exchange for Y instead of having public access to the document once the initial negotiation process is finished but before it is ratified by our government? You still get your information, you still get to see what's going on, and you still get input. I don't see the issue with that.
And if you are seeking education on the matter, Harvard Business School and the University of Chicago Business School have one metric ton of research and publications out on negotiation theory.