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This thread is old, but it's a great read.
Hear, hear.
And as for the only 'breakthroughs' being at TL 9 and TL 12, I suggest one look at the High Guard power table. At TLs 13 and 15, fusion plants become a lot smaller and cheaper, which makes a huge difference when the cost of your starship is dominated by the cost of the power plant. And smaller ships are harder to hit. The Imperium can put out a very nasty meson cruiser at less than 20 ktons, i.e., +0 to be hit. (It's possible at earlier TLs, but then you become very vulnerable to secondary weapons.)
--Devin