I like TA for the most part, but one thing that really bugs me is how much unique technology can be traded. The Yor have some excellent soldering techs that can turn the biggest pansies into a dangerous enemy on the ground. The iconians have this excellent +50% econ bonus building that seems really overpowered in others' hands. The Drengin and Korath can certainly share their insights as slavers, but how does Pain Amplification make sense in the hands of the Altarians? And the poor Arceans should
never be bullied into giving away weather control! That technology is entirely too strong to just pass around the galaxy to anybody who doesn't desperately need the boost (i.e., the Arceans for their navigation centers).
But more than just asking, "what makes sense to trade?", being able to trade for so many unique techs turns TA into DA with extra content. When you can get a hold of so many "unique" techs, everybody ends up being entirely too similar mid-game.
And possibly even more annoying is the fact that it's so vital to some races to get at other race's unique techs. Playing with tech trading off is no longer an option with some races having no access to starbase mining modules, good econ techs, morale techs (Hello, Thalans!), etc.
If at all possible I'd like to see the official, metaverse-friendly tech trees be (a) more balanced so races like the Thalan aren't impossible to keep happy (I assume balancing will happen anyway, but it's part of my rant, so I gotta mention it), and (

most of the interesting and powerful unique techs flagged untradeable. Stealing techs via invasion and espionage wouldn't be as annoying to me, because it's impossible to guarantee you'll get Awesome Unbalancing Technology X at the specific moment you need it most. But trading is just getting silly.
If SD wants this game to encourage playing each race due to the awesome differences, they need to disallow players from acquiring those differences in-game.