As another half-aside, I'm about 250 turns (*love* that new option) into a 1.95 game, gigantic map, 9 opponents, with tech trading off.
What new option are you talking about? What have I missed?
Plus, I'm playing Thalans again and it's really interesting to see how few structures make it across the new tech boundary when I flip a world. The Future Bugs are so weird they pretty much throw out everything the primitives built when they take over.
I totally dig the scrapping of unusable tiles. It makes war a lot less "clean" IMO, which is a good thing. I also enjoy tech trading being off now that tech stealing is so much more useful. Invading a planet is so much more interesting than it used to be, knowing you might nab yourself a tech that is otherwise totally unattainable. I actually try to target the arceans in the hopes I'll get lucky and steal a free engine tech that the rest of the universe can never have

The scrapping of tech also makes balance issues interesting. Thalans are considered overpowered by a few threads I've read, but they have to rebuild almost every structure when they conquer a planet! That can slow you down a lot compared to being Terran and getting to keep at least 50% of the structures on most worlds you take over. Not saying they're perfectly balance, I have no idea (still slowly working my way to the weirder races - Drath really rock at the moment). But it's much harder to claim balance issues without a lot of examination. Which means most people will spend less time worrying about such issues and more time enjoying the diversity.