I understand the pull to try and draw conclusions from the limited set of early details regarding balance but please be careful with the assumptions and read the whole post for more information (including the FAQ).
The lack of rank explicitly stating that you can trade LP uniques doesn’t imply that it won’t exist (it will). The FAQ talks about being able to trade items all the way up to and including Legendaries. Each Faction will have 10 ranks. At max MG rank, all types of equipable items will be tradable at the Bazaar.
I understand the desire for open trade but in order to accomplish our goal of not splitting the community and allowing people to play together regardless of the selected faction, we need to be able to balance the relative power of each. Even if you couldn’t play together, we would need to be able to balance the relative power. This means that we need to have dials on both sides of the equation. So, we are going to keep the limiters on trade.