TEC have their power in numbers beacuse they have cheaper units and better econ, they grow like a weed and in a good fight should outnumber the enemy. They also get the best armor in the game as well as some of the most interesing research projects. The TEC olso get great missle buffs 30% max! And possably in the end get better missle damage (alothough not the shield ingoring effect than the) Vasarii
The best bonuses for the TEC would be:
modjulated archetechure - great bonus! Resource Extractors go from 300 credits to 150 credits and friggate factorys go from 750 to 400 ish, cap factories get a discount too
Terrian Population upgrades: TEC can upgrade to an extra 30-40% population within the first few minutes of the game giving huge money boosts.
Foriegn Sabatoge: Makes all ship (and possibly buildings IDK) production time increace by 50% for your enimies, which slows them amazingly!
Pervasive Economy, gives you credits and resorces as the enemy spends them which lets you stay one step ahead of their growth
Insurgency: Makes periodic attacks AI against your enimies, (very similar to pirates) which is quite distracting to the enemy
The Dreaded Novalith cannon!!! This is the best strength for TEC late game, get two of these at the rear of your empire and focus fire on the enimies home world and cripple their economy and population! It has 3000 planet damage for each shot plus instant population decimation! E.G a 6000 hp homeworld V.S. 2 Novaliths = bye bye! The radiation of the shots gives a max population decreace of 40% a shot, which after 2 shots renders a world usless for money production
Given these abilites they do have low strengh at first (but are expansively fast) and moreso mid game, but late game they can make a comeback and cripple the enemy, plus they have the second best culture boosting abilities.
But yeah those are TECs distinguishing bonuses