Two cents time! Or in this case, two credits.
Ok so, you suggested that you can get Terran skins, and Terran ship models as a Jenquai. OR we enable Terran traders to build everything in the game. But you see, I do see this as game breaking. Horribly game breaking. What will happen if this will come into play. The other traders and explorer classes will become quite obsolete. Why make something that only makes a few things when you can have your shiny TT that can make everything and then some. Everyone will have one for themselves, Noone will have to rely on anyone else for any non-uber items. Interaction between players will drop dramatically, noone would have any use for anyone else really. The purpose in my opinion of leaving out at least one build skill on the terran trader is to promote more interaction, promote more in game economy.
Also, How fair would that be to people who have worked up JQ's for their reactor building. This people spent time making a character so that they could build these reactors for themselves and others, and then Terrans get the ability. It would kind of be a slap in the face to these people. Giving all build skills to all classes is even worse imo. Getting back to the original statement, Letting you pick Terran skins and ship models for non Terran characters... Why? In my experience in wow, I played an undead. I didn't like the model at all. But I did like the racial abilities. So rather than being vain I went for utility. You can choose either way but if you give everyone everything, the game loses it's uniqueness and becomes a giant blob of blah. To quote the "switcher" world of warcraft spoof video. "And not everyone had blonde hair!"